Area List, Tarryall Mountains, East Slope, Jefferson County, United States.

Eastern Mojave Vegetation

Detailed Area Plant List for Tarryall Mountains, East Slope, Jefferson County, United States.

Edited by Tom Schweich

This list is assembled from personal collections, herbarium vouchers, and published lists. For California, much of the data is provided by the participants of the Consortium of California Herbaria as indicated by a single dagger “†.” Their web site is at: (http://ucjeps.berkeley.edu/consortium/). For Colorado, much of the data is provided by the Southwest Environmental Information Network as indicated by a double dagger “‡,” which web site is found at (http://swbiodiversity.org). See their respective websites for copyright information and recommended citation formats.

For a complete list of Locations included in this Area List, see the Locations Included section, below.

For a check list, please see: Check List for Tarryall Mountains, East Slope, Jefferson County, United States.

Cupressaceae

Juniperus communis L. Common Juniper. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4279. 7/21/2025. .

- Dispersed Camp Site, 3892. 9/12/2024. .

Pinaceae

Pinus scopulorum Lemmon. (Syn: P. ponderosa Laws. var. scopulorum Engelm. ) CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4380. 8/18/2025. .

- Dispersed Camp Site, 3884. 9/12/2024. . .

Pseudotsuga menziesii (Mirb.) Franco. Douglas-fir. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4369. 8/18/2025. .

- Dispersed Camp Site, 3885. 9/12/2024. .

Amaranthaceae

Amaranthus powellii S. Watson. Powell's Pigweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In grus with Pseudotsuga menziesii, Artemisia frigida, A. ludoviciana var. incompta, Ribes cereum, and Cercocarpus montanus. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3489. 18 Aug 2025. ( Undist. ) .

Apiaceae

Aletes anisatus (A. Gray) W. L. Theob. & C. C. Tseng. (Syn: Cymopterus anisatus A. Gray ) Anise Indian Parsley. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- North Twin Creek, In bowl of grus between outctops of Pikes Peak granite, with Juniperus communis, Pseudotsuga menziesii, Pseudognaphalium macounii, Paronychia jamesii, Ribes cereum, Jamesia americana, and Muhlenbergia montana. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3491. 18 Aug 2025. ( Undist. ) Tom Schweich 4374. 8/18/2025. on a disintegrating outcrop of Pikes Peak granite Tom Schweich 4387. 8/18/2025. .

- Tarryall Mountains, East Slope, Soils are gravelly coarse sandy loams derived from weathered Pike's Peak granite. Forest within the 2002 hayman Fire, along FS Road 211 near the decommissioned Molly Gulch Campground. Paula Fornwalt 3. 20 May 2008. ( CS162583^‡ ) Disturbed site in mixed forest of Populus tremuloides/ Pseudotsuga menziesii/ Pinus ponderosa burned in Hayman Fire of 2002. Lost Creek Wilderness Area, Pike National Forest, Hankins Gulch Trail, SW of Goose Creek trailhead. Tim Hogan 5135. 3 Jun 2013. ( COLO1818806^‡ RMBL6353^‡ ) . .

Cymopterus lemmonii (J. M. Coult. & Rose) Dorn. (Syn: Pseudocymopterus montanus (A. Gray) J. M. Coult. & Rose ) Alpine False Springparsley. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

Perennial herb, to 15 cm., glabrous throughout, except very slightly scabrous at top of peduncle and on ribs of some rays; Pseudoscape, absent; Leaves, basal and cauline, 40 mm. × 25 mm. wide, obovate, compound, leaflets, #7, ultimate divisions narrowly lanceolate; Inflorescence, compound umbel; Involucre, bracts, 1.7 mm., linear (but not pinnafitid); Rays, ascending-spreading, ±equal; Involucel, bractlets green, inconspicuous, 1 mm.; Corolla, petals, #5, 1 mm. × 0.6 mm. wide, yellow; Stamens, #5; Filaments, recurved; Ovary, glabrous; Stylopodium, absent (?); Fruit, unknown. (Described from Coll. No. 1469, 29 June 2016)

- North Twin Creek, Open Douglas fir and ponderosa pine forest floor, away from the creek, without middlestory, also here: Nassella viridula. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 275 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3436. 2 Jul 2025. ( CS KHD ) .

- Twin Creek, Ponderosa pine and Douglas fir forest with Erigeron flagellaris, Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a shaded terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3406. 18 Jun 2025. ( CAS FLD OBI UCR ) . .

Heracleum maximum Bartr. Common Cow Parsnip. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- North Twin Creek, Streamside mature ponderosa pine and Douglas fir forest, also collected here: Monarda fistulosa, Rubis idaeus, and Verbascum thapsus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 185 m. northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3430. 2 Jul 2025. ( KHD ) Shaded forest of mostly mature Douglas fir, forest floor with aspen, roses, and geraniums; also collected here: Anticlea elegans. Within the perimeter of the Hayman Fire (2002), with fire intensity mapped as low at this location. In a forest glade where two branches join North Twin Creek, about 700 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3469. 21 Jul 2025. ( CAS OBI UCR ) .

Apocynaceae

Apocynum androsaemifolium L. Bitter Dogbane. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Open ponderosa pine and Douglas fir forest, with Juniperus communis, Achillea millefolium, Arctostaphylos uva-ursi, Androsace septentrionalis, and Elymus elymoides. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 435 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3462. 21 Jul 2015. ( KHD OBI ) .

Araliaceae

Aralia nudicaulis L. Wild Sarsaparilla. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, In moist soil in the shade of large Psuedotsuga. Pike National Forest. Growing along Goose Creek. Mark Duff 139. 14 Aug 1992. ( COLO451104^‡ ) .

Asclepiadaceae

Asclepias speciosa Torr. Showy Milkweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, This was being pollinated by a variety of insects, including at leaste two species of bees, ants, and a large unknown insect, all at the same time. Cheeseman Lake 7/5" Quadrangle. Along Forest Road 211. Stephen B. Austin 838. 23 Jul 2013. ( KHD59787^‡ ) .

Asteraceae

Achillea millefolium L. (Syn: A. lanulosa Nutt. , A. m. L. var. alpicola (Rydb.) Garrett , A. m. L. var. lanulosa (Nutt.) Piper , A. m. L. var. occidentalis DC. ) Common Yarrow. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb to 50 cm.;; Leaves alternate, tendrils absent, finely dissected, aromatic when fresh; Inflorescence, heads enclosed by an involucre, in flat-topped clusters; Phyllaries in 2+ series; Receptacles bearing scale-like bracts (paleate); Perianth in 2 or more whorls, parts in 5s; Phyllaries in 2+ series, not all subtending ray flowers; Flowers open, bisexual, two kinds, some with strap-shaped corollas; Petals fused into a tube; Ray flowers, white, lobe ovate; Disc flowers, white; Stamens = in number to corolla lobes; Ovary inferior. Pistils, 1 per flower (Described from Coll. No. 482, 30 Nov 2011, and Coll. No. 1023, 24 Jul 2013).

- North Twin Creek, 4229. 7/2/2025. Open ponderosa pine and Douglas fir forest, with Juniperus communis, Apocynum androsaemifolium, Achillea millefolium, Arctostaphylos uva-ursi and Elymus elymoides. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 435 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3460. 21 Jul 2025. ( CAS FLD OBI ) .

- Dispersed Camp Site, 3879. 9/12/2024. . .

Antennaria rosea Greene. Rosy Pussytoes. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 9 cm., stoloniferous 4-5 cm., forming loose mats in wet muddy soil, all sixteen plants collected pistillate (gynoecious?); Leaves, simple, white tomentose both sides, basal, 35 mm. × 9 mm wide, oblanceolate, cauline, 11-13 mm., linear; Inflorescence, >> basal leaves; Involucre, 5.5-7.0 mm.; Bracts (phyllaries), 5.0-6-5 mm. × 1.1-0.7 mm. wide, green at base, purplish band in middle, tips, white, scarious. (Described from Coll. No. 1083, 25 April 2015).

- Tarryall Mountains, East Slope, aspen grove-marshland Wigwam Ranch. John B. Hartwell 736. 4 July 1937. ( KHD2217^‡ ) . .

Artemisia frigida Willd. Prairie Sagewort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 30 cm., woody at base; Stems many; Leaves alternate, 9 mm., pinnately dissected into 7 parts, silvery hairy; Inflorescence raceme-like, indeterminate, heads 1-3 in axils; Heads have only disk flowers, all alike; Involucre of hairy phyllaries; Phyllaries in 2 series, hairy, not gummy or with tips recurved; Receptacle hairy, not chaffy or bristly; Flowers fertile; Pappus absent; (Described from Coll. No. 1067, 8 Oct 2014).

- Dispersed Camp Site, 3881. 9/12/2024. .

- Twin Creek, 4181. 6/18/2025. Southwest facing slope. Collected with Symphyotrichum porteri; also here: Senecio spartioides, Cercocarpus montanus, Verbascum thapsus, Bouteloua gracilis, and Eriocoma robusta. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 200 m. generally west on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3507. 3 Sep 2025. ( KHD ) . .

Artemisia ludoviciana Nutt. ssp. incompta (Nutt.) D. D. Keck. White Sagebrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In grus with Pseudotsuga menziesii, Artemisia frigida, Ribes cereum, and Cercocarpus montanus. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3488. 18 Aug 2025. ( Undist. ) .

- Twin Creek, Southwest facing slope. Collected with Artemisia frigida and Symphyotrichum porteri; also here: Senecio spartioides, Cercocarpus montanus, Verbascum thapsus, Bouteloua gracilis, and Eriocoma robusta. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 200 m. generally west on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3507.1 3 Sep 2025. ( OBI ) . .

Cirsium arvense (L.) Scop. (Syn: Breea arvensis (L.) Lessing ) Canada Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 70 cm., tap-rooted; Leaves, cauline, alternate, sessile but not obviously decurrent, 85 mm. × 20 mm. wide, margin sinuate, spiny, adaxial thinly tomentose, abaxial tomentose; Inflorescence, panicle(?); Heads, many, 30±, 15 mm. × 8 mm. dia., disk flowers only, dioecious, staminate heads, pappus < corolla, pistillate heads, pappus > corolla; Phyllaries, many (6-7) series, outer 3 mm. × 1.5 mm. wide, inner 15 mm. × 1 mm. wide, dark dorsal ridge, tips, spinulose, reflexed; Receptacle, soft bristles, 10 mm.; Pappus, plumose bristles (Described from Coll. No. 1512, 24 July 2016).

- North Twin Creek, 4226. 7/2/2025. . .

Cirsium vulgare (Savi) Ten. Bull Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.

Leaves, adaxial face with slender appressed bristle-like prickles.

- Twin Creek, 4179. 6/18/2025. . .

Dieteria bigelovii (A. Gray) D. R. Morgan & R. L. Hartman var. bigelovii. Bigelow's Tansy Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In grus with Pseudotsuga menziesii, Amaranthus powellii, Artemisia frigida, Ribes cereum, and Cercocarpus montanus. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3489.1 18 Aug 2025. ( Undist. ) .

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, Eriocoma lettermanii, Bouteloua gracilis, and Bouteloua simplex. This area burned in the Hayman Fire of 2002. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3372. 12 Sep 2024. . .

Ericameria parryi (A. Gray) G. I. Nesom & G. I. Baird var. affinis (A. Nelson) G. L. Nesom & G. I. Baird. Parry's Rabbitbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Broad terrace on right bank of Twin Creek About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 235 m. generally west on old roads into the Twin Creek drainage, 11.9 km. southwest of Deckers. Tom Schweich 3510. 3 Sep 2025. ( KHD OBI ) . .

Erigeron canadensis (L.) Cronquist. (=Conyza canadensis (L.) Cronquist) Canadian Horseweed. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 70 cm.; Leaves, alternate, lanceolate, to 60 mm. × 6 mm.; Inflorescence, panicle-like; Heads, many, inconspicuously radiate (i.e., two kinds of flowers, some flowers strap-shaped, but not obvious unless examined closely); Phyllaries, weakly graduated, with 1 central vein turning red-brown when dry; Receptacle epaleate; Flowers, rays: 0.7 mm. (measured from opening of tube to tip of lobe[s]), pistillate, white, disc: yellow, 4-lobed; Pappus, well-developed bristles (Described from Coll. No. 518, 2 Aug 2007).

- North Twin Creek, 4389. 9/3/2025. . .

Erigeron divergens Torr. & A. Gray. Spreading Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual or short-lived perennial, to 15 cm., tap-rooted, ±spreading hairy throughout, becoming minutely glandular above, hairs multicellular with clear crosswalls; Leaves, basal, absent or withered; cauline, alternate, petiole ±10 mm. + blade ±12 mm. × 2.4 mm. wide, uniformly hairy, somewhat reduced above; Inflorescence, heads borne singly on leafy stems, peduncles spreading or decurved, but cannot be described as “heads nodding;” Involucre, 3 mm. × limb 12 mm.; Receptacle, epaleate; Flowers, 2 kinds; Rays, corolla, 3.5 mm., white fading blue; Disk flowers, corolla, 1.7 mm., yellow; Pappus, short scales and longer capillary bristles, similar on ray and disk flowers; Cypsela, 0.8 mm. (Described from Coll. No. 1489. 13 July 2016. See also Coll. No. 3381).

- Dispersed Camp Site, Thin ponderosa pine forest with Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, Eriocoma nelsonii, and Vulpia octoflora. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3381. 12 Sep 2024. ( Undist. ) . .

Erigeron flagellaris A. Gray. Trailing Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 5-6 cm., with scapose inflorescence to 9 cm., spreading by leafy stoloniferous branches; Leaves, basal and cauline, entire, basal, linear-oblanceolate, 35 mm. × 2.5 mm., cauline, linear, 13 mm. × 1.5 mm.; Inflorescence, single heads on scape to 8 cm.; Receptacle epaleate; Phyllaries, 2+series, ±equal, 4 mm., hairy abaxially, ascending multicellular hairs with clear crosswalls, glandular between hairs; Flowers of 2 kinds; Pappus of bristles, 2 mm., + short scales, that of ray and disc flowers alike; Rays, #±80, corolla white, fading lilac, 8 mm. × 0.5 mm.; Disc flowers, corolla yellow, lobes triangular; Achene, short hairy. (Described from Coll. No. 1116, 28 May 2015).

- Tarryall Mountains, East Slope, South slope: dry, gravelly soil, with grass and weeds. Pike National Forest: Goose Creek. K. J. Helwick 13. 1 Jun 1916. ( USFS477732^‡ ) .

- Twin Creek, Ponderosa pine and Douglas fir forest with Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3405. 18 Jun 2025. ( CAS COLO FLD ) . .

Erigeron subtrinervis Rydb. ex Porter & Britton. Threenerve Daisy. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Small patch in mature Douglas fir and ponderosa pine forest, with Achillea millefolium, Cirsium arvense, Erigeron speciosus, Gaillardia aristata, Monarda fistulosa, Verbascum thapsus, and Bromus porteri. This area mapped as unburned within the perimeter of the Hayman Fire (2002). In a forest glade where two branches join North Twin Creek, about 610 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3465. 21 Jul 2025. ( CAS COLO CS ) . .

Gaillardia aristata Pursh. Blanketflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, alternate, entire to toothed; Inflorescence, single heads on peduncles 13-18 cm., flowers of 2 kinds; Phyllaries, 2+ series, 17 mm. × 2.7 mm. wide, lance-linear; Receptacle, epaleate, setae, to 10 mm.; Rays, sterile, corolla, 21 mm. × 10 mm. wide, yellow, deeply 3-lobed; Disk flowers, corolla, 7 mm., purple; Pappus of 6+ aristate scales, 4 mm., awn 2×> body. Described from Coll. No. 1205, 12 Jul 2015.

- North Twin Creek, 4225. 7/2/2025. .

- Twin Creek, 4184. 6/18/2025. . .

Heterotheca foliosa (Nutt.) Shinners. (Syn: Heterotheca villosa (Pursh) Shinners var. foliosa (Nutt.) V.L. Harms ) Hairy False Goldenaster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 40 cm.; Stem, spreading hairy, glandular; Leaves, cauline, alternate, 33 mm. × 9 mm. wide, oblong, margin entire, tip acute, appressed hairy; Peduncle, 15 mm.; Bracts, leafy, 10-16 mm. × 2.5 mm., lanceolate, some exceeding heads by 4-7 mm.; Involucre, 9 mm. × 14 mm. wide; Phyllaries, in 4+ graduated series, 4-9 mm. × 1 mm. wide, lanceolate, slightly keeled proximally, mostly green, abaxial surface glandular and hairy, margin hairy; Receptacle, epaleate, short (0.5 mm.) scales; Flowers, 2 kinds; Rays, sterile, corolla, 11 mm., yellow; Disk flowers, corolla, 7 mm., yellow; Pappus, short (0.6 mm.) and long (6 mm.) bristles, ≥disk corolla; cypsela, 1.3 mm., hairy. Described from Coll. No. 1258, 26 Jul 2015.

- North Twin Creek, Forest floor, tall ponderosa pine and Douglas fir that appear to have survived the Hayman Fire (2002) In a forest glade where two branches join North Twin Creek, about 670 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3466. 21 Jul 2025. ( CAS CS EIU FLD ) . .

Heterotheca villosa (Pursh) Shinners var. minor (Hook.) Semple. Hairy False Goldenaster. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, Eriocoma lettermanii, Bouteloua gracilis, and Bouteloua simplex. This area burned in the Hayman Fire of 2002. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3376. 12 Sep 2024. ( Undist. ) . .

Hymenothrix dissecta (A. Gray) B. G. Baldwin. (Syn: Amauriopsis dissecta (A. Gray) Rydb. , Bahia dissecta (A. Gray) Britton ) Ragleaf Bahia. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, This area burned in the Hayman Fire of 2002. In a pool of grus between outcrops of Pikes Peak granite. With Pinus ponderosa, Achillea millefolium, Cryptantha virgata, Campanula rotundifolia, Arctostaphylos uva-ursi, Jamesia americana, Cercocarpus montanus, Holodiscus dumosa, Rubus deliciousus, Verbascum thapsus, and Bouteloua gracilis. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3495. 18 Aug 2025. ( Undist. ) .

Leucanthemum vulgare (Vaill.) Lam. (Syn: Chrysanthemum leucanthemum L. ) Ox-eye Daisy. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 75 cm., creeping rootstock; Stem, glabrous, proximally purple, distally green; Leaves, basal withered at anthesis, cauline, alternate, sessile, blade, 47-52 mm. × 15 mm. wide, reduced distally, spatulate, irregularly toothed, glabrous; Involucre, 4 mm. × 11 mm. wide, ±flat; Phyllaries, in 3± series, unequal, lower < upper; 7 mm. × 2 mm. wide, green with dark-brown scarious margins, eglandular, margins, flat; Receptacle, epaleate; Flowers of 2 kinds; Rays, #30±, tube 2 mm. + blade 12 mm. × 3.5 mm. wide, white; Disc flowers, many, tube 2 mm. + lobes 0.5 mm., yellow; Pappus, absent; Cypsela, 1.5 mm., glabrous, black with many (10?) tan ribs, dehiscing readily (Described from Coll. No. 3289 & 3290, 3 Jul 2024).

- North Twin Creek, Shade of willows. This area burned in the Hayman Fire of 2002. Streambed and banks of North Twin Creek just below where crossed by F. R. 211, about 6.8 miles west and south from its north end on County Road 126, 11.4 km. southwest of Deckers. Tom Schweich 3514. 3 Sep 2025. ( CAS COLO CS UCR ) . .

Liatris punctata Hook. Dotted Blazing Star. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 32 cm.; Leaves, cauline, alternate, 78 mm. × 3.5 mm. wide, gradually reduced above, linear, glandular punctate, margins, entire, revolute, sparsely hairy; Inflorescence, single heads in axils on short pedicels; Involucre, 16 mm. × 7 mm. wide, ±cylindrical; Phyllaries, in 2+ series, inbricate, 14 mm. × 3.8 mm. wide, glandular-punctate abaxially distally, margin, ciliate, scarious, tip acute; Receptacle, epaleate; Flowers, one kind; Disk flowers; Corolla, tube white 8 mm. + lobes purple 2.5 mm.; Pappus, bristles, one series, 10 mm., plumose; Cypsela, 7 mm., hairy. Described from Coll. No. 1264, 29 Jul 2015.

- North Twin Creek, With Pinus ponderosa, Aletes anisatus, Achillea millefolium, Cryptantha virgata, Arctostaphylos uva-ursi, Jamesia americana, Cercocarpus montanus, Holodiscus dumosa, Rubus deliciosus, Verbascum thapsus, and Bouteloua gracilis. In grus adjacent to outcrops of Pikes Peak granite. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3496. 18 Aug 2025. ( Undist. ) .

- Dispersed Camp Site, 3889. 9/12/2024. . .

Packera fendleri (A. Gray) W.A. Weber & �. L�ve. (Syn: Senecio fendleri A. Gray ) Fendler’s Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Sunny south-facing hillside in ponderosa forest. Originally ID as Senecio fendleri. Lost Creek Project. Lost Creek Area, Tarryall Mtns., 80 km (50 mi) southwest of Denver and 80 m northwest of Colo. Springs. Near Goose Creek trailhead. P. Murphy 79143. 9 July 1979. ( COLO114942^‡ ) .

- Twin Creek, Open Ponderosa pine forest floor almost devoid of understory, with small Cercocarpus montanus, and occasional Artemisia ludoviciana, Erysimum capitatum, Drymocallis fissa, and Potentilla hippiana. Hayman Fire (2002) mapped as moderate intensity here. Above Twin Creek and Goose Creek, 100 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3412. 18 Jun 2025. ( OBI ) Open Ponderosa pine forest floor almost devoid of understory, with small Cercocarpus montanus, and occasional Artemisia ludoviciana, Erysimum capitatum, Drymocallis fissa, and Potentilla hippiana. Hayman Fire (2002) mapped as moderate intensity here. Above Twin Creek and Goose Creek, 90 m. south of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3413. 18 Jun 2025. ( CAS COLO ) . .

Pericome caudata A. Gray. Mountain Tail-Leaf. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Fracture in bare granite. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, outcrop of Pikes Peak granite, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3501. 18 Aug 2025. ( Undist. ) . .

Pseudognaphalium macounii (Greene) Kartesz. Macoun�s Rabbit-Tobacco. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual (?) to 45 cm.; Leaves, cauline, alternate, 40 mm. × 4 mm. wide, decurrent, lance-linear, entire, stalked glandular, tomentose abaxially; Inflorescence, branched axial and terminal; Heads in tight clusters, disciform; Involucre, 4 mm.; Receptacle, epaleate; Phyllaries in 4+ series, hyaline; Pappus, bristles. Described from Coll. No. 1257, 26 Jul 2015.

- North Twin Creek, In bowl of grus between outctops of Pikes Peak granite, with Juniperus communis, Pseudotsuga menziesii, Aletes anisatus, Paronychia jamesii, Ribes cereum, Jamesia americana, and Muhlenbergia montana. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3490. 18 Aug 2025. ( Undist. ) . .

Rudbeckia hirta L. var. pulcherrima Farw. Black-Eyed Susan. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Streamside among aspen and water birch near creek in mature ponderosa pine and Douglas fir forest, also collected here: Betula occidentalis, Monarda fistulosa, Primula pauciflora, Rosa acicularis ssp. sayi, and Rubus idaeus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 215 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3433. 2 Jul 2025. ( COLO CS FLD ) . .

Rudbeckia laciniata L. var. ampla (A. Nelson) Cronquist. Cut-Leaf Coneflower.. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Streamside among aspen and water birch near creek in mature ponderosa pine and Douglas fir forest, also collected here: Betula occidentalis, Monarda fistulosa, Rosa acicularis ssp. sayi, Rubis idaeus, and Verbascum thapsus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 205 m. northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3431. 2 Jul 2025. ( UCR ) . .

Senecio spartioides Torr. & A. Gray. (Syn: S. multicapitatus Greenm. ex Rydb. ) Broomlike Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 50 cm.; Leaves, basal, unknown, cauline, alternate, 90 mm. × 3 mm. wide, narrowly oblanceolate, reduced above to 30 mm. × 1 mm. wide, variously hairy in axils and ±lower surface; Involucre, 12.5 mm. × 6 mm., narrowly campanulate, bractlets not prominent; Phyllaries, 2 series? or 1 series with 2 forms? outer, 7.5 mm. × 0.7 mm. wide, all green, inner, 7.5 mm. × 1.3 mm. wide, centrally green with margins chartaceous, all tips dark; Receptacle, epaleate; Rays, fertile, corolla, tube 5 mm. + blade 9 mm. × 2 mm. wide, yellow, lobes 3; Disk flowers, corolla, 6 mm., yellow; Pappus, 1 series of fine capillary bristles, 5 mm.; Cypsela, 4 mm., 5-angled, dark gray, “hirtellous” throughout (not just the angles). Described from Coll. No. 1298, 23 Sep 2015.

- North Twin Creek, With Artemisia frigida, Drymocallis fissa, and Muhlenbergia montana. In grus adjacent to outcrops of Pikes Peak granite. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3499. 18 Aug 2025. ( Undist. ) .

Solidago missouriensis Nutt. Missouri Goldenrod. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 35-40 cm., generally glabrous throughout; Leaves, basal, unknown, cauline, alternate, petiole 10-45 cm. + blade 100 mm. × 21-22 mm. wide, reduced above, oblanceolate, margin, sparsely scabrous proximally, serrate distally, glabrous, prominently 3(5)-nerved; Inflorescence, crowded panicle; Pedicels, 1 mm.; Bracts, #2, 1.8 mm.; Involucre, 3.0-4.5 mm. × 3-5 mm. wide, obconic; Phyllaries, 2+ series, 2.2-3.5 mm. × 1 mm. wide, graduated, green, margin chartaceous, veins 1; Receptacle, epaleate, conic; Flowers, 2 kinds; Rays, #12, fertile, tube 2 mm. + blade 2.2 mm., yellow; Disk flower, #12, tube 2.8 mm. + lobes 0.7 mm. = 3.5 mm., yellow; Pappus, capillary bristles, 3.0 mm.; Cypsela, 0.4-0.6 mm., glabrous-sparsely hairy. Described from Coll. No. 1255, 26 Jul 2015, and Coll. No. 1519, 29 Jul 2016. Distinguished in part by its glabrous characters and presence of 3 prominent nerves on leaves. Jepson eFlora notes that S. missouriensis Nutt. Is misapplied to S. spectabilis (D. C. Eaton) A. Gray. FNANM states that, in the west, it can be similar to smaller plants of S. spectabilis (13 Sep 2014).

- North Twin Creek, Mature, burned stumps and down trunks, and immature ponderosa pine and Douglas fir, with some aspens. Within the perimeter of the Hayman Fire (2002), mapping shows this location on the boundary between unburned and low intensity fire. Beside boulder near where two branches join North Twin Creek, about 860 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3471. 31 Jul 2025. ( CAS KHD UCR ) With Pinus ponderosa, Aletes anisatus, Achillea millefolium, Cryptantha virgata, Arctostaphylos uva-ursi, Jamesia americana, Cercocarpus montanus, Holodiscus dumosa, Rubus deliciosus, Verbascum thapsus, and Bouteloua gracilis. In grus adjacent to outcrops of Pikes Peak granite. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3497. 18 Aug 2025. ( Undist. ) .

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Hymenothrix dissecta, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, Eriocoma lettermanii, Bouteloua gracilis, and Bouteloua simplex. This area burned in the Hayman Fire of 2002. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3375. 12 Sep 2024. ( OBI UCR248676^‡ ) . .

Symphyotrichum foliaceum (DC.) G. L. Nesom var. parryi (D. C. Eaton) G. L. Nesom. Parry's Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 12 cm., long rhizomatous; Stem, proximal glabrate, hairy in lines decurrent from leaf bases, hairy in inflorescence; Leaves, basal and cauline, alternate, petiole 20 mm. + blade 90 mm. × 22 mm. wide, reduced distally, entire, ciliate, tips, rounded; Inflorescence, heads 1-4 per stem, ≥leaves; Involucre, 8 mm. × 12 mm. wide, hemispheric; Phyllaries, graduated, 3±-series, chartaceous base to tip green, eglandular, margins, flat, somewhat ciliate, tip, acute, some reflexed(?); Receptacle, epaleate; Flowers, of 2 kinds; Ray flowers, many, tube 2 mm. + blade 10 mm. × 1.7 mm. wide, white, some tinged lavender, fading to lavender, fertile; Disk flowers, many, tube 4.5 mm. + lobes 0.5 mm., yellow; Pappus, many, bristles, 3.0-3.7 mm., ±equal; Cypsela, 2.5 mm. × 0.5 mm. wide, light brown, sparsely hairy (Described from Coll. No. 2728, 18 Aug 2021).

- Twin Creek, With Bouteloua gracilis. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 220 m. generally west on old roads into the Twin Creek drainage, 11.9 km. southwest of Deckers. Tom Schweich 3508. 3 Sep 2025. ( Undist. ) . .

Symphyotrichum porteri (A. Gray) G.L. Nesom. (Syn: Aster porteri A. Gray ) Smooth White Aster. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 35 cm., eglandular, generally not hairy; Stem ascending; Leaves, cauline, alternate, sessile, 53 mm. × 3 mm. wide, lance-linear, many rolled, tip pointed, maybe spinulose, generally glabrous except some distal margins; Inflorescence, crowded, ±flat-topped; Heads borne simgly on short pedicels; Involucre, 5 mm. × 8 mm. wide; Phyllaries, 2+series, 3.5 mm. × 0.7 mm. wide, ±equal, inner ≥ outer, mid-vein green, margins white proximally, green distally, tip acute; Receptacle, epaleate, convex (if not conic); Flowers of two kinds; Rays, fertile, corolla, 6.5 mm., white; Disk flowers, corolla, 3.0 mm., yellow; Pappus, bristles, barbed, single, 2.5 mm.; Cypsela, 0.7 mm., sparsely hairy. Described from Coll. No. 1266, 29 Jul 2015.

- North Twin Creek, 4386. 8/18/2025. .

- Dispersed Camp Site, Thin ponderosa pine forest with Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Castilleja integra, Eriocoma nelsonii, and Vulpia octoflora. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3383. 12 Sep 2024. ( KHD83591^‡ ) .

- Twin Creek, Southwest facing slope. Also here: Artemisia frigida, Senecio spartioides, Cercocarpus montanus, Verbascum thapsus, Bouteloua gracilis, and Eriocoma robusta. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 200 m. generally west on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3506. 3 Sep 2025. ( FLD UCR ) . .

Townsendia grandiflora Nutt. Largeflower Townsend Daisy. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 15 cm.; Stem, villous; Leaves, opposite below, alternate above, 32-43 mm. × 3 mm. wide, narrowly oblanceolate, long ciliate at base; Inflorescence, heads borne singly; Involucre, 12 mm. × 25 mm. wide; Phyllaries, 5+ imbricate series, 13 mm. × 2.5-3.0 mm. wide, ±equal, ovate, margin ciliate, tip acuminate, green around prominent mid-vein, chartaceous margins; Receptacle, flat, epaleate, very short bristles; Flowers of two kinds; Rays, sterile, pappus, scales, 0.6 mm., corolla, 14-21 mm. × 1.2-1.5 mm. wide, white with purple center; Disk, 14-21 mm. wide, pappus, bristles, 4.0 mm., corolla, 4.5-5.0 mm., yellow; cypsela, 4 mm. × 1.3 mm., laterally compressed (Described from Coll. No. 1247, 24 Jul 2015, and Coll. No. 1404, 8 June 2016).

- Dispersed Camp Site, Thin ponderosa pine forest with Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Castilleja integra, Eriocoma nelsonii, and Vulpia octoflora. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3382. 12 Sep 2024. ( Undist. ) .

Betulaceae

Alnus incana (L.) Moench ssp. tenuifolia (Nutt.) Brietung. Thinleaf Alder. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Dense thicket about 125 m. by 25 m. wide on both sides of Twin Creek. Coll. Nos. 3511 and 3512.1 have only pistillate catkins; Coll. No. 3512 has both pistillate and staminate catkins. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 325 m. generally northwest on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3511. 3 Sep 2025. ( JCOS ) Dense thicket about 125 m. by 25 m. wide on both sides of Twin Creek. Coll. Nos. 3511 and 3512.1 made on the ends of the thicket have only pistillate catkins; Coll. No. 3512 made in the middle of the thicket has both pistillate and staminate catkins. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 325 m. generally northwest on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3512. 3 Sep 2025. ( KHD ) Dense thicket about 125 m. by 25 m. wide on both sides of Twin Creek. Coll. Nos. 3511 and 3512.1 made on the ends of the thicket have only pistillate catkins; Coll. No. 3512 made in the middle of the thicket has both pistillate and staminate catkins. About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 325 m. generally northwest on old roads into the Twin Creek drainage, 11.8 km. southwest of Deckers. Tom Schweich 3512.1 3 Sep 2025. ( Undist. ) . .

Betula occidentalis Hook. (Syn: Betula fontinalis Sarg. ) Water Birch. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Streamside with aspen in mature ponderosa pine and Douglas fir forest, also collected here: Monarda fistulosa, Circaea alpina, Primula pauciflora var. pauciflora, Rosa acicularis ssp. sayi, and Rubus idaeus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 230 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3435. 2 Jul 2025. ( CAS FLD OBI UCR ) .

Boraginaceae

Cryptantha virgata (Porter) Payson. (=Oreocarya virgata (Porter) Greene) Miner"s Candle. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, occasional 4223. 7/2/2025. 4383. 8/18/2025. . .

Hackelia floribunda (Lehm.) I. M. Johnst. Many-Flowered Stickseed. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4388. 9/3/2025. . .

Lithospermum multiflorum Torrey ex A. Gray. Many Flowered Stoneseed. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial � cleistogamous flowers absent. Flowers heterostyled and dimorphic.

- Molly Gulch, Steep slope above Goose Creek, open ponderosa pine and Douglas fir forest. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. Between Molly Gulch and the former Molly Gulch campground, about 8 miles west and south on F. R. 211 from County Road 126, then 200 m. east toward Goose Creek, 12.1 km. southwest of Deckers. Tom Schweich 3400. 18 Jun 2025. ( CAS EIU FLD OBI ) .

- Dispersed Camp Site, 3886. 9/12/2024. . .

Mertensia ciliata (Torr.) G. Don var. ciliata. Tall Fringed Bluebells. CalPhotos. Jepson eFlora. SEINet Taxon.

Variety ciliata accepted in Colorado beginning with Ackerfield (2nd edition, 2022).

- North Twin Creek, Bank of creek among willows, with Dasiphora fruticosa, Platanthera aquilonis, Carex stipata, and Juncus sp. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, 870 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3437.1 2 Jul 2025. ( FLD UCR ) . .

Oreocarya virgata (Porter) Greene. (Syn: Cryptantha virgata (Porter) Payson ) Miner"s Candle. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Sunny south-facing hillside in ponderosa forest. Lost Creek Project; Miner's candle. Originally identified as Cryptantha virgata. Handwritten note says = Oreocarya. Lost Creek Area, Tarryall Mtns., 80km (50mi) southwest of Denver and 80km northwest of Colo. Springs, near Goose Creek trailhead. P. Murphy 79144. 9 Jul 1979. ( COLO429233^‡ ) . .

Phacelia hastata Douglas ex Lehm. Silverleaf Phacelia. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In loose, deep grus with: Pinus ponderosa, Pseudotsuga menziesii, Artemisia ludoviciana, Mentzelia speciosa, Phacelia sp., Ribes cereum, and Cercocarpus montanus. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3494. 18 Aug 2025. ( Undist. ) . .

Phacelia heterophylla Pursh. Varileaf Phacelia. CalPhotos. Jepson eFlora. SEINet Taxon.

Described by Pursh (1814) from a collection by M. Lewis Jun-Jul, 1806 on the banks of the Kooskooskie (Clearwater) River.

- Tarryall Mountains, East Slope, Cheeseman Lake 7.5" Quadrangle. Along the Forest Road #211 roadside. Stephen B. Austin 836. 23 Jul 2013. ( KHD59788^‡ ) .

Brassicaceae

Erysimum capitatum (Hook.) Greene. Sanddune Wallflower. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial or at least biennial, 16 cm. 25-45 cm., hairs dolabriform throughout; Root, tap; Stems, erect, leafy, proximal not woody hairs as above; Leaves, basal and cauline, basal, petiole, indistinct, ±10 mm., + blade, 50-100 mm. × 2.5-3 mm. wide, narrowly oblanceolate, margin 1-3 shallowly pinnate dentate, cauline, nearly sessile, 42 mm. × 2.5 mm. wide, ±linear, margin, entire, reduced distally; Inflorescence, raceme 130 mm. × 45 mm. wide, not bracted; Pedicels, 3-6 mm., elongating as flower matures, ascending; Flowers, radial; Sepals, #4, rows, 1, 7 mm. × 1-1.5 mm. wide, narrow and wide pairs opposite, lateral pair basally saccate; Petals, claw, 10-11 mm. + blade 6-9 mm. × 4-6 mm. wide, spoon-shaped, margin, entire, color, yellow, orange; Stamens, #6, 11 & 15 mm., tetradynamous (2 short, 4 long); Anthers, 4.5 mm.; Ovary, 4 mm.; Style, 9 mm.; Stigma, capitate; Fruit, 17-34 mm. × 1 mm. wide, 4-angled, ascending, hairy as above; Seeds, unknown (Described from Coll. Nos. 206, 1835, & 2306).

- Twin Creek, 4189. 6/18/2025. .

Campanulaceae

Campanula rotundifolia L. (=Campanula petiolata A. DC.) Harebell. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, basal, ?, cauline, alternate, ±lance-linear, 52 mm. × 2.5 mm. wide; Inflorescence, solitary and loose racemes; Pedicel, 9 mm.; Calyx, tube 2.5 mm. + 5 lobes 2.5 mm. = 5.0 mm.; Corolla, 13 mm, blue-purple; Capsule, nodding, 5.5 mm. × 4.5 mm. wide, opening by pores near the base. Described from Coll. No. 1246, 24 July 2015.

- North Twin Creek, 4382. 8/18/2025. .

- Dispersed Camp Site, 3890. 9/12/2024. .

Cannabaceae

Humulus neomexicanus (A. Nelson & Cockerell) Rydb. New Mexican Hops. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Jumbled down logs with shrubs and herbs including Artemisia frigida, Cirsium vulgare, Ribes idaeus, R. inerme, Thalictrum fendleri, Physocarpus monogynus, and Prunus virginiana. Mixed burned and live mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low to medium intensity here. On the right bank of Twin Creek, 130 m. above its mouth at Goose Creek, about 180 m. east-southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3411. 18 Jun 2025. ( KHD OBI ) .

Caprifoliaceae

Lonicera involucrata (Richardson) Banks ex Spreng. Twinberry Honeysuckle. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Stream bank shrub Wigam Ranch, Colorado John B. Hartwell 708. 4 Jul 1937. ( KHD13231^‡ ) .

Caryophyllaceae

Eremogone fendleri (A. Gray) Ikonnikov. (Syn: Arenaria fendleri A. Gray ) Fendler's Sandwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, tufted, to 30 cm.; Stem, proximal glabrous, distal short glandular hairy “peg-like hairs”; Leaves, mostly basal, cauline, stipules absent, opposite, 50 mm. × 0.5 mm. wide, linear to needle-like, erect to appressed, margin finely scabrous, tip small spinulose; Inflorescence, open cyme; Pedicels, 3-8 mm.; Sepals, #5 distinct, 4.5-5.0 mm. × 1 mm. wide, glandular hairy (or stipitate glandular); Petals, white, 5 mm., entire; Stamens, #10; Anthers, purple; Styles, #3. Described from Coll. No. 1270, 1374, and 2372.

- Dispersed Camp Site, 3891. 9/12/2024. .

- Twin Creek, 4192. 6/18/2025. . .

Paronychia jamesii Torr. & A. Gray. James' Nailwort. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial erect subshrub, to 15 cm.; Leaves, cauline, opposite, 10 mm., linear, pointed, stipules, 4-5 mm., papery; Inflorescence, many-flowered cyme; Sepals, #5, 2.3 mm., greenish, awn-tipped; Petals, absent. Described from Coll. No. 1263, 29 July 2015.

- North Twin Creek, 4373. 8/18/2025. .

Chenopodiaceae

Chenopodium leptophyllum (Moq.) Nutt. ex S. Watson. Narrowleaf Goosefoot. CalPhotos. Jepson eFlora. SEINet Taxon.

Annual, to 80 cm., scaly or powdery throughout; Stem, not jointed, striated; Leaves, weakly fleshy, flattened, primary, 31 mm. × 3.5 mm., lance-linear, 1-veined from base, top acute to rounded, not spine-tipped, short-petioled to sessile, distal not clasping; Flowers, bisexual, calyx lobes 5, appendages 0, condition in fruit unknown; Stamens 5; Ovary superior; Stigma branches 2; Seeds not available, assumed to be horizontal (Described from Coll. No. 1012, 22 July 2013).

- Twin Creek, Also here: Artemisia frigida, Senecio spartioides, Euphorbia serpyllifolia, Cercocarpus montanus, Verbascum thapsus, Bouteloua gracilis, and Eriocoma robusta. Along an old road into Twin Creek from F. R. 211, 11.8 km. southwest of Deckers. Tom Schweich 3503. 3 Sep 2025. ( Undist. ) .

Cornaceae

Cornus canadensis L. (Syn: Chamaepericlymenum canadense L.) Asch. & Graebn. ) Bunchberry Dogwood. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, In moist soil along creek in the shade of large Pseudotsuga. Pike National Forest. Growing along Goose Creek. Mark Duff 131. 14 Aug 1992. ( COLO253427^‡ ) . .

Cornus sericea L. ssp. sericea. (Syn: C. stolonifera Michaux ) Creek Dogwood. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Ponderosa pine and Douglas fir forest with Ribes cereum, Anemonastrum canadense, Geum macrophyllum, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3401. 18 Jun 2025. ( KHD OBI UCR ) .

Crassulaceae

Sedum lanceolatum Torr. (Syn: Amerosedum lanceolatum (Torr.) A. L�ve & D. L�ve ) Spearleaf Stonecrop. CalPhotos. Jepson eFlora. SEINet Taxon.

Type collected by Edwin James on the Long Expedition, described by Torrey, 1827.

- North Twin Creek, In granite sand and gravel among outcrops of Pikes Peak granite with an open ponderosa pine and Douglas fir forest and Jamesia americana and Scutellaria brittonii. Mature trees suggest the Hayman Fire (2002) burned with low intensity here. Above the left bank of North Twin Creek, 125 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3416. 18 Jun 2025. ( FLD ) .

Ericaceae

Arctostaphylos uva-ursi (L.) Sprengel. (Syn: Arctostaphylos uva-ursi (L.) Sprengel ssp. adenotricha (Fernald & J.F.Macbr.) Calder & Roy L.Taylor ) Bearberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4377. 8/18/2025. At the base of small Douglas fir in open ponderosa pine and Douglas fir forest, with Juniperus communis, Achillea millefolium, Apocynum androsaemifolium, Achillea millefolium, and Elymus elymoides. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 435 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3461. 21 Jul 2025. ( FLD ) Small trees in an open ponderosa pine forest. This area mapped as unburned within the perimeter of the Hayman Fire (2002). Slope south of North Twin Creek, about 815 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3472. 21 Jul 2025. ( CS REGIS ) .

- Dispersed Camp Site, 3894. 9/12/2024. .

- Tarryall Mountains, East Slope, Plants forming low mats, open ponderosa -douglas fir forest on Pike's Peak granite gravel substrate. Abundant and widespread. Front Range, Tarryall Mountains, South Platte River below Cheeseman Reservoir. Along jeep trail about 1 miles E of Pike National Forest rd 211, 2 miles W of South Platte River at the head of Wildcat Creek. Loraine Yeatts 1264. 4 May 1986. ( KHD30608^‡ ) .

Euphorbiaceae

Euphorbia serpillifolia Pers. (Syn: Chamaesyce s. (Pers.) Small ) Thymeleaf Sandmat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Also here: Artemisia frigida, Senecio spartioides, Chenopodium leptophyllum, Cercocarpus montanus, Verbascum thapsus, Bouteloua gracilis, and Eriocoma robusta. Edge of a drying mud puddle in an old road between Twin Creek and F. R. 211, 11.8 km. southwest of Deckers. Tom Schweich 3505. 3 Sep 2025. ( Undist. ) .

Fabaceae

Oxytropis lambertii Pursh. Purple Locoweed. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, acaulescent, mostly dolabriform hairs (one arm much shorter than the other); Leaves, basal, pinnately compound, leaflets #17, terminal leaflet present; Inflorescence, raceme, peduncle 30 cm., pedicels very short; Bracts, 7 mm. × 1.6 mm. wide, green, lanceolate; Calyx, tube 7 mm. + lobes 4 mm. = 11 mm.; Flower, zygomorphic, various shades of magenta to purple, banner, 17 mm., wings, 16 mm., keel, 13 mm., blades united enclosing stamens, recurved beak; Stamens, #10, diadelphous (Described from Coll. No. 1385, 1 June 2016).

- North Twin Creek, Open ponderosa pine and Douglas fir forest, Penstemon virens also collected at this location. Mature trees suggest the Hayman Fire (2002) burned with low intensity here. Beside a cow/horse trail along North Twin Creek, 60 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3415. 18 Jun 2025. ( CAS EIU FLD OBI UCR ) . .

Oxytropis multiceps Nuttall. Southwestern Locoweed. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Open poderosa-douglas fir forest on Pikes Peak granite gravel substrate. Abundant on W facing steep, gravelly roadside, common. Front Range, Yarrtall Mountains, South Platte River below Cheesman Reservoir, road cut along Pike National Forest Road 211, on hill above Goose Creek Campground. Loraine Yeatts 1263. 4 May 1986. ( KHD11306^‡ ) . .

Trifolium pratense L. Red Clover. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, erect, to 50 cm., hairs not hooked at tips; Stem, spreading hairy; Stipules, 21 mm. × 5 mm. wide, connate, scarious with several green nerves; Leaves, ternately compound, leaflets, 38 mm. × 20 mm. wide, margins slightly wavy tip short mucronate (easier to see on young leaves), both sides long wavy hairy; Heads, sessile, subtended by stipules and a pair of leaves, many flowers; Fruit, unknown. Introduced. (Described from Coll. No. 1458, 27 June 2016.)

- North Twin Creek, Shade of willows. This area burned in the Hayman Fire of 2002. Flood plain of North Twin Creek just below where crossed by F. R. 211, about 6.8 miles west and south from its north end on County Road 126, 11.4 km. southwest of Deckers. Tom Schweich 3513. 3 Sep 2025. ( Undist. ) .

Fumariaceae

Corydalis aurea Willd. Scrambled Eggs. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Disturbed site in mixed forest of Populus tremuloides/ Pseudotsuga menziesii/ Pinus ponderosa burned in Hayman Fire of 2002. Lost Creek Wilderness Area, Pike National Forest, Hankins Gulch Trail, SW of Goose Creek trailhead. Tim Hogan 5134. 3 Jun 2013. ( COLO1818814^‡ RMBL6329^‡ ) .

Geraniaceae

Geranium caespitosum James. Pineywoods Geranium. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Gentle northeast slope, open ponderosa pine and Douglas fir woodland, also collected here: Castilleja integra and Ceanothus fendleri. Burned by the Hayman Fire (2002), though mapped as low intensity in this location. Near top of a low ridge south of North Twin Creek, 140 m. west of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3421. 18 Jun 2025. ( KHD ) .

- Dispersed Camp Site, 3880. 9/12/2024. . .

Geranium richardsonii Fisch. & Trautv. Richardson's Geranium. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, herbaceous, green & photosynthetic, to 60 cm.; Leaves, simple, palmately lobed, into 5-7 lobes, largest 44–57 mm. × 87–96 mm. wide, petioles 17–19 mm.; Inflorescence (cymules!) 2-flowered; Pedicels, 9–15 mm., hairs topped with purple glands (per Taylor, 2010); Flowers, open, radial, bisexual, in 5×n parts; Perianth, 2 whorls; Petals, 5, free, hairy ≤½ adaxial surface, 15 mm. × 7 mm. wide, white; tips rounded; Nectaries, not wooly or lanate (per TJM2 & Aedo, 2012), but few small straight hairs, without tuft of hairs on top; Stamens, 10, 2×petals; Ovary superior; Pistil 1; Stigmas, (in fruit) 3–4 mm.; Mericarp with basal callus (Described from Coll. No. 1014, 22 July 2013).

- North Twin Creek, Mature ponderosa pine and Douglas fir forest away from creek, also here: Rudbeckia hirta var. pulcherrima, G. caespitosum, Monarda fistulosa, Primula pauciflora, Rosa acicularis ssp. sayi, and Rubus idaeus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 210 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3434. 2 Jul 2025. ( CS EIU FLD ) .

Grossulariaceae

Ribes cereum Douglas. Wax Currant. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4370. 8/18/2025. .

- Dispersed Camp Site, 3887. 9/12/2024. .

- Twin Creek, small-leaved compared to those seen in metro-Denver 4175. 6/18/2025. . .

Ribes inerme Rydb. White Stem Gooseberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, 4176. 6/18/2025. .

Hydrangeaceae

Jamesia americana Torr. & A. Gray. Fivepetal Cliffbush. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4379. 8/18/2025. . .

Jamesia americana Torr. & A. Gray var. americana. Fivepetal Cliffbush. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In granite sand and gravel among outcrops of Pikes Peak granite with an open ponderosa pine and Douglas fir forest and Scutellaria brittonii and Sedum lanceolatum. Mature trees suggest the Hayman Fire (2002) burned with low intensity here. Above the left bank of North Twin Creek, 125 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3418. 18 Jun 2025. ( CAS COLO UCR ) .

Lamiaceae

Monarda fistulosa L. Wild Bergamot. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4218. 7/2/2025. 4227. 7/2/2025. . .

Prunella vulgaris L. Common Selfheal. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4276. 7/21/2025. . .

Scutellaria brittonii Porter. Britton's Skullcap. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In granite sand and gravel among outcrops of Pikes Peak granite with an open ponderosa pine and Douglas fir forest and Jamesia americana and Sedum lanceolatum. Mature trees suggest the Hayman Fire (2002) burned with low intensity here. Above the left bank of North Twin Creek, 125 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3417. 18 Jun 2025. ( FLD ) .

Loasaceae

Mentzelia speciosa Osterh. (Syn: Nuttallia speciosa (Osterh.) Greene ) Plains Blazing Star. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, In loose, deep grus with: Pinus ponderosa, Pseudotsuga menziesii, Artemisia ludoviciana, Phacelia sp., Ribes cereum, and Cercocarpus montanus. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3493. 18 Aug 2025. ( Undist. ) .

- Tarryall Mountains, East Slope, 4278. 7/21/2025. .

Montiaceae

Phemeranthus parviflorus (Nutt.) Kiger. (Syn: P. confertiflorus (Greene) Hershk. , Talinum confertiflorum Greene ) Sunbright. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, dense in crack between boulders. 3878. 9/12/2024. .

Onagraceae

Circaea alpina L. Small Enchanter's Nightshade. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Streamside among aspen and water birch near creek in mature ponderosa pine and Douglas fir forest, also collected here: Betula occidentalis, Monarda fistulosa, Primula pauciflora, Rosa acicularis ssp. sayi, and Rubis idaeus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 205 m. northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3432.1 2 Jul 2025. ( FLD ) . .

Oenothera coronopifolia Torr. & A. Gray. Crownleaf Evening Primrose. Hierba de San Juan.. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Mature Douglas fir and ponderosa pine forest, with Oxytropis lambertii and Penstemon virens nearby. Within the perimeter of the Hayman Fire (2002); this area is mapped as low intensity. Along horse/cow trail above the left bank of the creek, about 100 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3443. 2 Jul 2025. ( FLD UCR ) . .

Oenothera villosa Thunb. Hairy Evening Primrose. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 25 cm., ±straight hairy throughout; Stem, eglandular, villous, hairs with red pustular bases; Leaves, cauline, alternate, sessile, 55 mm. × 12 mm. wide, elliptical, reduced above, entire, very shallowly toothed; Inflorescence, leafy bracteate spike; Sepals, #4, 13 mm., reflexed; Floral tube, 24 mm.; Petals, #4, 9 mm. × 5 mm. wide, yellow fading pink, obovate, entire; Stigma, lobes #4; Capsules, 25-33 mm.; Seeds, 0.8 mm., squarish, glabrous throughout. Described from Coll. No. 1271, 29 July 2015.

- North Twin Creek, 4230. 7/2/2025. .

Orobanchaceae

Castilleja integra A. Gray. Wholeleaf Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Gentle northeast slope, open ponderosa pine and Douglas fir woodland, also collected here: Geranium caespitosum and Ceanothus fendleri. Burned by the Hayman Fire (2002), though mapped as low intensity in this location. Near top of a low ridge south of North Twin Creek, 140 m. west of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3422. 18 Jun 2025. ( FLD UCR ) .

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Eriocoma lettermanii and Bouteloua simplex. This area burned in the Hayman Fire of 2002. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3378. 12 Sep 2024. ( KHD83559^‡ OBI ) . .

Orobanche fasciculata Nutt. (Syn: Aphyllon fasciculatum (Nutt.) Torr. & A. Gray ) Clustered Broomrape. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, on dry bank where N. Twin Creek crosses the Road. 4194. 6/18/2025. .

Plantaginaceae

Linaria vulgaris Mill. Butter and Eggs. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Mixed down and mature live Douglas fir and ponderosa pine, with Cryptantha virgata, Oenothera villosa, and Ipomopsis aggregata. Within the perimeter of the Hayman Fire (2002), While this area is mapped as unburned, there are burned trees and down logs here. Along horse/cow trail above the left bank of the creek, about 350 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3441. 2 Jul 2025. ( CAS COLO UCR ) . .

Penstemon virens Pennell ex Rydb. Front Range Beardtongue. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Open ponderosa pine and Douglas fir forest, Oxytropis lambertii also collected at this location. Mature trees suggest the Hayman Fire (2002) burned with low intensity here. Beside a cow/horse trail along North Twin Creek, 60 m. northwest of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3414. 18 Jun 2025. ( FLD KHD UCR ) .

- Tarryall Mountains, East Slope, Lost Creek Wilderness Area, Pike National Forest, Hankins Gulch Trail, SW of Goose Creek trailhead. Lost Creek Wilderness Area, Pike National Forest, Hankins Gulch Trail, SW of Goose Creek trailhead. Tim Hogan 5136. 3 Jun 2013. ( COLO1818798^‡ RMBL6352^‡ ) . .

Synthyris plantaginea (James) Benth. (Syn: Besseya plantaginea (James) Rydb. , Veronica plantaginea James ) White River Kittentails. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- North Twin Creek, Gentle northeast slope, open ponderosa pine and Douglas fir woodland, also collected here: Eremogone fendleri and Heuchera parvifolia. Burned by the Hayman Fire (2002), though mapped as low intensity in this location. Low ridge south of North Twin Creek, 120 m. west northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3420. 18 Jun 2025. ( OBI UCR ) . .

Veronica americana (Raf.) Benth. American Speedwell. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Ponderosa pine and Douglas fir forest with Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. In running water and creek gravel on the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3403. 18 Jun 2025. ( KHD ) .

Polemoniaceae

Ipomopsis aggregata (Pursh) V. E. Grant. (Syn: Gilia aggregata (Pursh) Sprengel ) Scarlet Gilia. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, 3882. 9/12/2024. . .

Ipomopsis aggregata (Pursh) V.E. Grant ssp. collina (Greene) Wilken & Allard. Scarlet Gilia. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, 50-60 cm.; Stem, glandular, few long white hairs; Leaves, basal and cauline similar, 37 mm. × 24 mm. wide, pinnatifid with narrow segments, reduced above; Inflorescence, narrow thyrse; Pedicels, 1-2.5 mm.; Calyx, tube 5 mm. + lobes 1.5 mm., glandular, hyaline sinuses, tips spinulose; Corolla, salverform, tube 25 mm. × 1.8 mm. gradually expanding to 5 mm. wide, + lobes 5 mm., spreading; Stamens, some barely exserted (Described from Coll. No. 2172, 23 Jul 2019).

- North Twin Creek, Mixed down and mature live Douglas fir and ponderosa pine, with Cryptantha virgata, Oenothera villosa, and Linaria vulgaris. Within the perimeter of the Hayman Fire (2002), While this area is mapped as unburned, there are burned trees and down logs here. Along horse/cow trail above the left bank of the creek, about 325 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3442. 2 Jul 2025. ( CAS FLD ) .

Polygonaceae

Eriogonum alatum Torrey in L. Sitgreaves, Rep. Exped. Zuni Colorado Rivers. 168, plate 8. 1853. (Syn: Pterogonum alatum (Torr.) Gross ) Winged Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, 4191. 6/18/2025. .

Primulaceae

Androsace septentrionalis L. (Syn: Androsace septentrionalis L. ssp. subumbellata (A. Nelson) G. T. Robbins ) Pygmyflower Rockjasmine. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, At the base of small Douglas fir in open ponderosa pine and Douglas fir forest, with Juniperus communis, Achillea millefolium, Apocynum androsaemifolium, Achillea millefolium, and Elymus elymoides. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 435 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3461.1 21 Jul 2025. ( FLD ) . .

Lysimachia ciliata L. Fringed Loosestrife. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 40 cm.; Leaves, cauline, opposite, petiole, 12 mm., sparsely long ciliate, blade, 72 mm. × 26 mm. wide, lanceolate, glabrous, margin minutely ciliate; Inflorescence, axillary, flowers borne singly on long pedicels; Pedicel, 30 mm.; Sepals, #5, 4 mm.; Petals, #5, 7 mm. × 6 mm. wide, free ≥½length, yellow; Stamens, #5, alternate; Filaments, 2 mm., attached near base; Anthers, 2 mm.; Ovary, superior; Style, #1, 3 mm., lengthening to 4 mm. at maturity; Fruit, 3 mm. × 3 mm. dia., globose, bluish. Described from Coll. No. 1723, 28 Jul 2018.

- North Twin Creek, 4277. 7/21/2025. . .

Primula pauciflora (Durand) A. R. Mast & Reveal var. pauciflora. (Syn: Dodecatheon pulchellum (Raf.) Merr. ) Darkthroat Shooting Star. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Streamside among aspen and water birch near creek in mature ponderosa pine and Douglas fir forest, also collected here: Betula occidentalis, Monarda fistulosa, Rosa acicularis ssp. sayi, Rubis idaeus, and Verbascum thapsus. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity. Left bank of North Twin Creek, 205 m. northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3432. 2 Jul 2025. ( FLD OBI ) .

Ranunculaceae

Anemonastrum canadense (L.) Mosyakin. (Syn: Anemone canadensis L. ) Candian Anemone. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- Twin Creek, Ponderosa pine and Douglas fir forest with Erigeron flagellaris, Cornus sericea, Ribes cereum, Geum macrophyllum var. perincisum, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3405.1 18 Jun 2025. ( KHD OBI ) . .

Thalictrum fendleri Engelm. ex A. Gray. Fendler's Meadow Rue. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, 4177. 6/18/2025. .

Rhamnaceae

Ceanothus fendleri A. Gray. Fendler's Ceanothus. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, With Pinus ponderosa, Aletes anisatus, Achillea millefolium, Solidago missouriensis, Cryptantha virgata, Arctostaphylos uva-ursi, Jamesia americana, Cercocarpus montanus, Holodiscus dumosa, Rubus deliciosus, and Verbascum thapsus. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3500. 18 Aug 2025. ( Undist. ) .

- Twin Creek, 4193. 6/18/2025. .

Rosaceae

Cercocarpus montanus Raf. Alder-Leaf Mountain Mahogany. CalPhotos. Jepson eFlora. SEINet Taxon.

Described by Rafinesque from a specimen collected by Edwin James of the Long Expedition, 1820, probably in present Jefferson County, Colorado. Rafinesque was somewhat frustrated by Torrey's reluctance publish a new species name in assigning James' collection to C. fothergillides Humb. Bonpl. And Kunth.

- North Twin Creek, 4368. 8/18/2025. 4376. 8/18/2025. .

- Dispersed Camp Site, 3883. 9/12/2024. .

- Twin Creek, 4187. 6/18/2025. . .

Dasiphora fruticosa (L.) Rydb. (Syn: Potentilla fruticosa L. ) Shrubby Cinquefoil, Golden Hardtack. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Bank of creek among aspen and river birch, with Mertensia ciliata, Platanthera aquilonis, Carex stipata, and Juncus sp. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, about 870 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3438. 2 Jul 2025. ( CAS UCR ) . .

Drymocallis fissa (Nutt.) Rydb. (Syn: Potentilla fissa Nutt. ex Torr. & A.Gray ) CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, 4186. 6/18/2025. 4190. 6/18/2025. . .

Geum macrophyllum Willd. Large-leaf Avens. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 50 cm., plant drying green; Leaves, upper stem leaves divided near to base; Sepals 5; Hypanthium bractlets (not visible); Petals 5 (not visible); Style continuous to fruit, 3 mm., hooked, not plumose, without bristles, non-glandular; Fruit, many per flower, 2.5 mm (Described from Coll. No. 438.1, 12 Nov 2012, var. perincisum considered indistinct).

- Tarryall Mountains, East Slope, Growing along a small creek in a cool damp grotto. Pike National Forest. Side drainage of Goose Creek 1 mile west of Hankens Gulch. Mark Duff 129. 14 Aug 1992. ( COLO689679^‡ ) . .

Geum macrophyllum Willd. var. perincisum (Rydb.) Raup. Large-leaf Avens. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, Ponderosa pine and Douglas fir forest with Cornus sericea, Ribes cereum, Anemonastrum canadense, Galium boreale and Carex inops ssp. heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3402. 18 Jun 2025. ( EIU FLD KHD REGIS ) . .

Holodiscus discolor (Pursh) Maxim. Ocean Spray. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4381. 8/18/2025. . .

Holodiscus discolor (Pursh) Maxim. var. microphyllus (Rydb.) Jeps. (Syn: H. microphyllus Rydb. , H. microphyllus Rydb. var. microphyllus ) Ocean Spray. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial shrub, to 2 m.; Leaves, alternate and alternate clusters, 12 mm. × 11 mm. wide, base wedge-shaped, widest at or below middle, toothed distally, teeth entire, veins pinnate, glands 0; Inflorescence, raceme; Pedicels, 4.5 mm., bractlets, #2; Petals, white; Ovary, superior; Pistils, #5, hairs dense bristle-like. Described from Coll. No. 1189, 26 June 2015. Treated as H. microphyllus Rydb. Var. microphyllus by FNANM.

- North Twin Creek, Mature, burned stumps and down trunks, and immature ponderosa pine and Douglas fir, with some aspens. Within the perimeter of the Hayman Fire (2002), mapping shows this location on the boundary between unburned and low intensity fire. Coordinates estimated from nearby collections. Determination per Ackerfield (2022). Base of boulder near where two branches join North Twin Creek, about 860 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3470. 21 Jul 2025. ( CAS KHD OBI UCR ) . .

Physocarpus monogynus (Torr.) J.M. Coult. (Syn: Spiraea monogyna Torr. ) Mountain Ninebark. CalPhotos. Jepson eFlora. SEINet Taxon.

Shrub, height unknown (growing in ravine); Leaves, alternate, simple, hairs stellate, petiole, 10 mm., blade, 30 mm. × 33 mm. wide, ovate, palmate-veined, doubly crenate; Inflorescence, umbellate corymb, ±20-flowered; Pedicels, 8-12 mm.; Flowers, limb, 12 mm., petals, 4.5 mm., color cream; Styles, 2 (Described from Coll. No. 1397, 8 June 2016).

- Twin Creek, 4183. 6/18/2025. . .

Potentilla L. Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, Lvs. pinnate, adaxial gray. 3888. 9/12/2024. . .

Potentilla hippiana Lehm. Wooly Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.

- Twin Creek, determination tentative 4188. 6/18/2025. . .

Potentilla hippiana Lehm. var. hippiana. Wooly Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 35 cm., woody caudex; Stem, unbranched, pilose; Leaves, basal and cauline, basal, 70 mm. × 24 mm. wide, pinnately compound, sericeous adaxially, tomentose and sericeous abaxially, distinctly bicolored or not, leaflets, #9, toothed along full length, cauline, reduced, stipules, 11 mm. × 3 mm. wide, lanceolate, entire, leaflets, #5, 24 mm. × 6 mm. wide, without decurrent bases, toothed along length; Inflorescence, cyme; Bractlets, ±same color as sepals; Petals, 5 mm. × 4.5 mm. wide, yellow; Styles, 2.7 mm., tapered from base, smooth (Described from Coll. No. 2182, 2902).

- North Twin Creek, Mature Douglas fir and ponderosa pine forest, with Achillea millefolium, Erigeron speciosa, Gaillardia aristata, Monarda fistulosa, Rubus idaeus, Verbascum thapsus, and Corallorhiza maculata. Within the perimeter of the Hayman Fire (2002), though this area mapped as unburned. Along horse/cow trail above the left bank of the creek, about 520 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3440. 2 Jul 2025. ( FLD ) . .

Prunus virginiana L. Chokecherry. CalPhotos. Jepson eFlora. SEINet Taxon.

The most useful distinction is between chokecherries found east of the Rocky Mountains, var. virginiana and those found from the mountains westward, var. demissa. Plants of the High Plains show intergradation between those of the Rockies and those of the East.

- Twin Creek, 4178. 6/18/2025. . .

Rosa acicularis Lindl. ssp. sayi (Schwein.) W. H. Lewis. (Syn: Rosa acicularis Lindl. , Rosa sayi Schweinitz ) Say's Acicular Rose. CalPhotos. Jepson eFlora. SEINet Taxon.

Prickles on new growth, leaflets 5-7(9), flowers 1-3

- North Twin Creek, The roses here have few narrow prickles on new growth, and 7 (9) leaflets, but they are not in bloom. They are probably R. acicularis var. sayi. 4221. 7/2/2025. . .

Rosa arkansana Porter. Prairie Rose. CalPhotos. Jepson eFlora. SEINet Taxon.

Low-growing perennial, to 20 cm.; Stem, straight slender unequal prickles, present on new growth; Leaves, alternate, compound, leaflets (7)9-11, 20 mm. × 9 mm. wide, serrate, teeth dark-tipped, unclear whether there is glandular exudate, sparsely villous on both sides; Flowers, in clusters of 2-5; Sepals, 16 mm. × 3 mm. wide, abaxial, stalked glandular, adaxial, glandular hairy; Petals, 28 mm. × 21 mm. wide, color pink (Described from Coll. No. 1456, 27 June 2016).

- Twin Creek, Ponderosa pine and Douglas fir forest with Cymopterus lemmonii, Erigeron flagellaris, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale, Carex inops var heliophila and Hesperostipa comata. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3410. 18 Jun 2025. ( OBI UCR ) . .

Rubus deliciosus Torr. (Syn: Oreobatus deliciosus Torr.(E. James ex Torr.) Rydb. ) Delicious raspberry. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial shrub, to 1.5 m.; Stem, bark, shreddy; Leaves, simple, 17 mm. × 23 mm. wide, palmate veined, lobed, serrate, few straight hairs, petiole, 11 mm.; Flowers, white, solitary, 17-19 mm.; Fruit, unknown (Described from Coll. No. 1091, 30 Apr 2015).

- North Twin Creek, 4375. 8/18/2025. . .

Rubus idaeus L. American Red Raspberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4220. 7/2/2025. .

- Twin Creek, 4182. 6/18/2025. . .

Rubus idaeus L. var. strigosus (Michx.) Maxim. American Red Raspberry. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Small patch in mature Douglas fir and ponderosa pine forest, with Achillea millefolium, Cirsium arvense, Symphyotrichum sp., Gaillardia aristata, Monarda fistulosa, Verbascum thapsus, and Bromus porteri. This area mapped as unburned within the perimeter of the Hayman Fire (2002). In a forest glade where two branches join North Twin Creek, about 610 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3464. 21 Jul 2025. ( KHD OBI UCR ) .

Rubiaceae

Galium boreale L. (Syn: Galium septentrionale Roem. & Schult. ) Bedstraw. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, to 40 cm.; Stems, ascending; Leaves, in whorls of 4, tips rounded, 3-nerved; Flowers, cream-colored; Fruit, short-hairy (Described from Coll. No. 2374, 23 June 2020).

- Twin Creek, Ponderosa pine and Douglas fir forest with Cymopterus lemmonii, Erigeron flagellaris, Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, and Carex inops var heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3408. 18 Jun 2025. ( CAS FLD ) .

Sapindaceae

Acer glabrum Torr. Rocky Mountain Maple. CalPhotos. Jepson eFlora. SEINet Taxon.

Described by Torrey (1827) from a collection by Edwin James of the Long Expedition (1820).

- Twin Creek, 4185. 6/18/2025. .

Saxifragaceae

Heuchera hallii A. Gray. Front Range Alumroot. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, joints in granite outcrops 4372. 8/18/2025. . .

Heuchera parvifolia Nutt. ex Torr. & A. Gray. Littleleaf Alumroot. CalPhotos. Jepson eFlora. SEINet Taxon.

� Inflorescence, (not secund) �

- North Twin Creek, Gentle northeast slope, open ponderosa pine and Douglas fir woodland, also collected here: Eremogone fendleri and Synthyris plantaginea. Burned by the Hayman Fire (2002), though mapped as low intensity in this location. Low ridge south of North Twin Creek, 120 m. west northwest of the F. R. 211 crossing of North Twin Creek. 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.5 km. southwest of Deckers. Tom Schweich 3419. 18 Jun 2025. ( CAS COLO ) .

Scrophulariaceae

Verbascum thapsus L. Common Mullein. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4219. 7/2/2025. 4228. 7/2/2025. 4371. 8/18/2025. 4384. 8/18/2025. 4385. 8/18/2025. .

Alliaceae

Allium cernuum Roth. Nodding Onion. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Openings in Douglas fir and ponderosa pine woodland. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 375 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3459. 21 Jul 2025. ( COLO EIU FLD ) .

- Dispersed Camp Site, 3895. 9/12/2024. .

Cyperaceae

Carex inops L. H. Bailey ssp. heliophila (Mack.) Crins. (Syn: C. pensylvanica Lam. ssp. heliophila (Mack.) W. A. Weber ) Sun Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial herb, to 16 cm., prior year leaves to 23 cm.; Rhizome, 5-10(12) cm.; Culm, 11.5 cm. × 0.6 mm., ±triangular, but obscured by white striations at least when dry; Leaves, 12 cm. × 1.5 mm., ±flat, some folded ≤30°.; Inflorescence, multiple spikes, all approximate, 1-2 pistillate spike(s) below, 1 staminate spike above; Bracts, lowest, blade 8 mm., sheath 4.5 mm., papery; Pistillate spike, peduncled 1.0-1.3 mm., 9 mm., brown (not black); Staminate spike, terminal, 12-16 mm., ovoid (not cylindric), brown (not black); Scales, >perigynum body; Perigynum, pubescent on faces, margin ciliate; Achenes, unknown. Described from Coll. No. 1079, 23 April 2015, and Coll. No. 1568, 3 Apr 2017.

- Twin Creek, Ponderosa pine and Douglas fir forest with Cymopterus lemmonii, Erigeron flagellaris, Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, and Galium boreale. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3407. 18 Jun 2025. ( FLD KHD ) . .

Carex interior L. H. Bailey. Inland Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Bank of creek among aspen and river birch, with Mertensia ciliata, Dasiphora fruticosa, Platanthera aquilonis, Juncus ensifolius, and Carex stipata. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, about 900 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3439.2 2 Jul 2025. ( KHD ) . .

Carex leptalea Wahlenberg. Bristly-stalked Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

Carex occidentalis L. H. Bailey. Western Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial sedge; Habit, caespitose; Culms, to 50 cm., slightly scabrous especially below the inflorescence; Leaves, 1.7 mm. wide, green, sheaths, white-hyaline, ventrally smooth; Inflorescence, 29 mm. × 10 mm. wide, loosely clustered; Spikes, identical appearing, 6 mm. × 5 mm. wide, terminal and lateral androgynous (there are no anthers, but the flowers at the top of each spike contain white filaments); Bracts, 5 mm., proximal, 10 mm., <inflorescence, leaf-like; Pistillate scales, 3.5 mm., <perigynia, mid-vein green, brown laterally, hyaline margin; Perigynia, #12 per spike, 4 mm. × 1.6-1.8(2) mm. wide, weakly winged, ±veinless, glabrous, beak, 1 mm., flattish, dorsally bulged and the margin is displaced but not onto the ventral face; Achene, 2.3 mm. × 1.5 mm. wide, biconvex, short oblong; Stigmas, #2; Anthers, n/a; (Described from Coll. No. 2056, 4 Jun 2019, but see also Coll. No. 1913.)

- Twin Creek, Ponderosa pine and Douglas fir forest with Cymopterus lemmonii, Erigeron flagellaris, Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale and Carex inops var heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3407.1 18 Jun 2025. ( KHD ) . .

Carex stipata Muhl. ex Willd. Saw Beaked Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Bank of creek among aspen and river birch, with Mertensia ciliata, Dasiphora fruticosa, Platanthera aquilonis, and Juncus sp. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, about 900 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3439. 2 Jul 2025. ( KHD OBI ) .

Iridaceae

Sisyrinchium montanum Greene. Rocky Mountain Blue-Eyed Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

- Tarryall Mountains, East Slope, Sunny area near stream. Lost Creek Area, Tarryall Mtns., 80km (50mi) southwest of Denver and 80km northwest of Colo. Springs. Near Goose Creek trailhead. P. Murphy 79145. 9 July 1979. ( COLO415000^‡ ) .

- Twin Creek, late in seed. 4390. 9/3/2025. .

Juncaceae

Juncus L. Rush. CalPhotos. Jepson eFlora. SEINet Taxon.

Juncus ensifolius Wikstr. Sword-Leaf Rush. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Bank of creek among aspen and river birch, with Mertensia ciliata, Dasiphora fruticosa, Platanthera aquilonis, and Carex stipata. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, about 900 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3439.1 2 Jul 2025. ( CAS ) .

Melanthiaceae

Anticlea elegans (Pursh) Rydb. (Syn: Zigadenus elegans Pursh ) Mountain Death Camas. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- North Twin Creek, Shaded forest of mostly mature Douglas fir, forest floor with aspen, roses, and geranium; also collected here: Heracleum maximum. Within the perimeter of the Hayman Fire (2002), with fire intensity mapped as low at this location. In a forest glade where two branches join North Twin Creek, about 700 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3468. 21 Jul 2025. ( CAS OBI UCR ) .

Orchidaceae

Corallorhiza maculata (Raf.) Raf. Summer Coralroot. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, determination tentative 4224. 7/2/2025. . .

Platanthera aquilonis Sheviak. Northern Green Orchid. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, Bank of creek among willows, with Mertensia sp., Dasiphora fruticosa, Carex stipata, and Juncus sp. Within the perimeter of the Hayman Fire (2002), though this area mapped as low intensity; vegetated only on the creek, forest not re-established away from creek. On a right branch of North Twin Creek, 870 m. upstream of the F. R. 211 crossing of North Twin Creek, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3437. 2 Jul 2025. ( OBI ) .

Poaceae

Bouteloua gracilis (Kunth) Lag. ex Griffiths. (Syn: Chondrosum gracile Kunth ) Blue Grama. CalPhotos. Jepson eFlora. SEINet Taxon.

- North Twin Creek, 4378. 8/18/2025. With Pinus ponderosa, Aletes anisatus, Achillea millefolium, Solidago missouriensis, Cryptantha virgata, Arctostaphylos uva-ursi, Jamesia americana, Cercocarpus montanus, Holodiscus dumosa, Rubus deliciosus, and Verbascum thapsus. In grus adjacent to outcrops of Pikes Peak granite. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3498. 18 Aug 2025. ( Undist. ) .

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, Eriocoma lettermanii and Bouteloua simplex. This area burned in the Hayman Fire of 2002. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3377. 12 Sep 2024. ( FLD KHD83421^‡ OBI UCR248674^‡ ) . .

Bouteloua simplex Lag. Matted Grama. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, and Eriocoma robusta. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3380. 12 Sep 2024. ( Undist. ) . .

Bromus porteri (J.M. Coult.) Nash. Nodding Brome. CalPhotos. Jepson eFlora. SEINet Taxon. Notes on Colorado Flora.

Perennial grass, 45 cm., caespitose; Leaves, sheath, 130 mm., open about ½-way; collar minutely hairy, ligule, 2 mm., blade, 130 mm. × 4 mm. wide, flat, scabrous; Inflorescence, nodding, 1 per culm, panicle; Rachis, ascending hairy, not quite appressed; Spikelets, many, 23 mm. × 2.8 mm. wide, similar, pedicels, 44 mm.; Compression, unremarkable; Glumes, soft spreading hairy, lower, 7.5 mm., veins, 3, upper 8.5 mm., < lowest floret, veins, 3, converging, awns, 0, but mid-vein goes strongly right to the tip; Florets, 8 per spikelet; Callus, few short hairs; Lemma, 10.5 mm., > glumes, rolled, hairy. veins, 5, convergent, awns, 1, 1 mm., subterminal, straight; Palea, 9.5 mm., < lemma, membranous, ciliate, tip rounded; Stamens, 3; Anthers, 2.2 mm. (Described from Coll. No. 2860, 18 July 2022.)

- North Twin Creek, Forest floor among tall conifers, mostly ponderosa pine, with Bromus tectorum. Within the perimeter of the Hayman Fire (2002), fire intensity mapped as low at this location. In a forest glade where two branches join North Twin Creek, about 700 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.7 km. southwest of Deckers. Tom Schweich 3467. 21 Jul 2025. ( CAS EIU KHD REGIS ) . .

Elymus elymoides (Raf.) Swezey. (Syn: E. longifolius (J. G. Sm.) Gould , Sitanion hystrix (Nutt.) J. G. Sm. ) Squirreltail Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass to 50 cm., clumped; Inflorescence, bilateral spike; Rachis, internodes, 6.4 mm., breaking apart when mature; Spikelets, 2 per node; Glumes, #2, subulate, 62-65 mm.; Florets, #3, lowest 2 fertile, upper sterile; Lemma, 10 mm. + awn 50 mm., veins, #5, converging; Palea, 9 mm., 1 of 2 veins slightly extended as bristle. Variety brevifolius if infraspecific names are to be applied. Described from Coll. No. 1717, 28 July 2017.

- North Twin Creek, Open ponderosa pine and Douglas fir forest, with Juniperus communis, Achillea millefolium, Arctostaphylos uva-ursi, Androsace septentrionalis, and Apocynum androsaemifolium. Within the perimeter of the Hayman Fire (2002). This area mapped as unburned though there are some charred stumps and down logs. Along a fading horse/cow trail on the ridge southwest of North Twin Creek, about 435 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3463. 21 Jul 2025. ( CAS FLD REGIS ) . .

Eriocoma robusta (Vasey) Romasch. (Syn: Achnatherum robustum (Vasey) Barkworth , Stipa robusta (Vasey) Scribn. ) Sleepy Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, Thin ponderosa pine forest with Erigeron divergens, Heterotheca villosa, Hymenothrix dissecta, Solidago missouriensis, Symphyotrichum porteri, Townsendia grandiflora, Castilleja integra, and Bouteloua simplex. Along Pike-San Isabel National Forest Road 211, about 3.6 miles generally southwest of its northern end at County Road 126 “Deckers Road,” 59 km. south of Golden. Tom Schweich 3379. 12 Sep 2024. ( KHD83420^‡ OBI UCR309639^‡ ) .

- Twin Creek, Also here: Artemisia frigida, Senecio spartioides, Chenopodium leptophyllum, Euphorbia serpyllifolia, Cercocarpus montanus, Verbascum thapsus, and Bouteloua gracilis. Along an old road into Twin Creek from F. R. 211, 11.8 km. southwest of Deckers. Tom Schweich 3504. 3 Sep 2025. ( CAS COLO FLD REGIS ) . .

Hesperostipa comata (Trin. & Rupr.) Barkworth. (Syn: Stipa comata Trin. & Rupr. ) Needle and Thread. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial, 50 cm., clumped, nonrhizomatous; Roots, fibrous; Stem, herbaceous; Leaves, blade and sheath differentiated; Sheath, 100-120 mm., open ≥½, glabrous; Ligule, membranous, length 3.7 mm., lacerate into 2 equal parts, auricles 0; Blade, 60 mm., involute, glabrous; Inflorescence, 1 per culm, >leaves, panicle, 200 mm. × 30 mm. wide; Rachis, not extended, somewhat scabrous throughout; Spikelets, many, similar, borne singly; Compression, unremarkable; Disarticulation, above the glumes; Glumes, lower, 23-34 mm., veins #3, upper, 23-29 mm., veins #5, awl-shaped, rounded, membranous, ±equal, tip, very narrow, not awned; Florets, 1 per spikelet; Callus, 4.5-50 mm., sharp, straight hairs 1.0-1.5 mm., color tan; Lemma, 9.5-10.0 mm., rolled, indurate, straight hairy 0.5 mm., color white-tan, veins #3(?), awns, #1, 125-160 mm., twisted and short straight hairy proximal 45 mm., bent, scabrous distally; Palea, 9 mm., ±lemma, few white hairs on mid-vein; Stamens, #3; Anthers, 6.5 mm. (Described from Coll. No. 1890, 28 May 2018).

- Twin Creek, Ponderosa pine and Douglas fir forest with Cymopterus lemmonii, Erigeron flagellaris, Cornus sericea, Ribes cereum, Anemonastrum canadense, Geum macrophyllum var. perincisum, Galium boreale, and Carex inops var heliophila. Mature Douglas fir and ponderosa pines suggest the Hayman Fire (2002) may have burned with low intensity here. On a terrace of the right bank of Twin Creek, near its mouth at Goose Creek, about 250 m. southeast of the Sheeprock Trailhead, 7.7 mi. west and south on F. R. 211 from County Road 126., 11.9 km. southwest of Deckers. Tom Schweich 3409. 18 Jun 2025. ( CAS FLD ) . .

Koeleria macrantha (Ledeb.) Schult. Prairie Junegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial bunch grass, to 45-55 cm., non-rhizomatous; Leaves, mostly basal or lowest cauline, cauline, sheath, 90 mm., open, ligule, <1-1.5 mm., membraneous, auricles, 0, blade, 40 mm., tip prow-shaped or merely constricted; Inflorescence, panicle, 60 mm. × 9 mm., shiny in anthesis due to exposure of translucent palae, short branches, branches short soft hairy; Spikelets, 5 mm., 1 per node on 1°-3° or indistinct panicle branches; Glumes, lower, 3 mm., veins 1, upper, 4 mm., veins 3; Florets, 3, #1 and #2 pistillate, #3 staminate, or variously mixed bisexual and pistillate, open, i.e., palea separated from lemma; Disarticulation, between florets; Rachilla hairy, extends nearly 1 mm. above upper floret (or not); extension undecorated; Lemma, 4.5 mm., veins 5, short hairy throughout, awn, 0-0.5 mm., short, soft; Palea, =lemma, translucent or colorless, exposed, i.e., outside lemma.; Stamens, 3, 1.8 mm. Described from Coll. No. 1131, 9 June 2015, and Coll. No. 1144, 15 Jun 2015.

- North Twin Creek, Open forest with Pinus ponderosa, Pseudotsuga douglasii, Antennaria sp., Artemisia frigida, and Arctostaphylos uva-ursi Along a horse/cow trail on the low ridge southwest of North Twin Creek, 315 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3458. 21 Jul 2025. ( CAS CS FLD ) . .

Muhlenbergia montana (Nutt.) Hitchc. Mountain Muhly. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 50 cm., caespitose; Leaves, sheath, open, ligule, membraneous, 4.5 mm., auricles, 0, blade, 110 mm. × 1 mm. wide; Inflorescence, rather sparse contracted panicle, 120 mm.; Florets per spikelet, #1; Glumes, #2, papery, toothed, lower, 1.5 mm., upper, 2 mm., teeth 3; Lemma, 3 mm. + awn 13 mm., flexuous, tuft of hairs at base; Palea, 2.8 mm. Described from Coll. No. 1282, 28 Aug 2015.

- North Twin Creek, In bowl of grus between outctops of Pikes Peak granite, with Juniperus communis, Pseudotsuga menziesii, Aletes anisatus, Paronychia jamesii, Ribes cereum, and Jamesia americana. This area burned in the Hayman Fire of 2002. East slope of Tarryall Mountains, small ridge above Forest Road 211 and North Twin Creek, along a horse or cow trail, 11.3 km. (geodesic) southwest of Deckers. Tom Schweich 3492. 18 Aug 2025. ( Undist. ) .

Muhlenbergia wrightii Vasey ex J.M. Coult. Spike Muhly. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 60 cm., caespitose; Culms, erect, not rooting at nodes, short hairy; Leaves, sheath, open, 12 cm., ligule, membraneous, 1 mm., auricles 0, blade, 12 cm. × 1.5 mm., folded; Inflorescence, narrow (4 mm.) spike-like panicle; Spikelets, neither enclosed in burs nor in pairs; Florets, 1 per spikelet, reduced florets absent; Glumes, ±equal, 1.5 mm. + awn 0.5 mm.; Disarticulation, above the glumes; Lemma, 2 mm. × 0.5 mm. wide + awn 0.5 mm. (usually described as “mucronate” rather than awned); Palea, ?. Described from Coll. No. 1276, 30 Jul 2015.

- Twin Creek, Small terrace beside Twin Creek. With Symphyotrichum foliaceum var. parryi and Bouteloua gracilis About 7 miles west and south on F. R. 211 from its north end at County Road 126 to a USFS designated parking place, then about 220 m. generally west on old roads into the Twin Creek drainage, 11.9 km. southwest of Deckers. Tom Schweich 3509. 3 Sep 2025. ( CAS FLD REGIS UCR ) . .

Nassella viridula (Trin.) Barkworth. (Syn: Stipa viridula Trin. ) Green Needlegrass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, 70-100 cm., clumped, non-rhizomatous; Stem, herbaceous; Leaves, cauline, sheath, 17 mm., ligule, 3 mm., membraneous, collar with few hairs at sides, blade, to 30 cm., convolute; Inflorescence, 1 per culm, panicle, 20-25 cm.; Rachis, lightly scabrous, not extended beyond upper spikelet; Compression, unremarkable; Spikelets, 1 per node; Florets, 1 per spikelet, bisexual; Glumes, 2, 8-9 mm., ±equal, rounded, membraneous, colorless, exc. 3 green veins, tip, short (2 mm.) hair-like awn; Disarticulation, above the glumes, Florets, 1 per spikelet; Callus, short; Lemma, 5-6 mm. × 1.2 mm. wide, <glumes, green, hairy, <1 mm., indurate, enclosing grain, awns, #1, 20-25 mm., twisted, bent, short hairy (±0.2 mm.); Palea, 1.5-2.0 mm., <lemma, membraneous, glabrous; Stamens, #3. Described from Colls. No. 1146, 1652, and 1698.

- North Twin Creek, 4222. 7/2/2025. . .

Pseudoroegneria spicata (Pursh) A. L�ve. (Syn: Elymus spicatus (Pursh) Gould ) Bluebunch Wheat Grass. CalPhotos. Jepson eFlora. SEINet Taxon.

Perennial grass, to 40 cm., rhizomatous, glabrous throughout; Inflorescence, 2-sided spike; Spikelets, 1 per node, flatside to rachis, sessile, overlap 28%; Disarticulation, above the glumes; Glumes, lanceolate, rolled, lower glume, 8 mm., veins 3 (not symmetric), short tip, upper glume, 9 mm., veins 4 (visible, not symmetric) awn 1 mm.; Lemma 10 mm., veins 5, awn 10 mm. divergent when dry; Palea, 9 mm. (Coll. No. 3458.1, 21 July 2025)

- North Twin Creek, Open forest with Pinus ponderosa, Pseudotsuga menziesii, Antennaria sp., Artemisia frigida, Arctostaphylos uva-ursi, and Koeleria macrantha. Along a horse/cow trail on the low ridge southwest of North Twin Creek, 315 m. northwest of the crossing of North Twin Creek by F. R. 211, 6.8 mi. west and south on F. R. 211 from its north end at County Road 126, 11.6 km. southwest of Deckers. Tom Schweich 3458.1 21 Jul 2025. ( KHD ) . .

Schizachyrium scoparium (Michx.) Nash. Little Bluestem. CalPhotos. Jepson eFlora. SEINet Taxon.

- Dispersed Camp Site, 3893. 9/12/2024. .

Total number of taxa:	138
Native Taxa: (serif, italic, bold)	130
Exotic Taxa: (sans-serif, italic)	6
Nativity Undetermined: (default font, italic)	2
Listed Weeds: Identified as Weed	5

Notes:

† -- Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
‡ -- Southwest Environmental Information Network, SEINet. 2009-2014. http//:swbiodiversity.org/seinet/index.php. Accessed from July 2009 to September 2014.

Locations Included in This Area

Tarryall Mountains, East Slope.

Twin Creek.

Bibliography

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Date and time this article was prepared: 1/9/2026 3:04:32 PM.