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Detailed Area Plant List for Heritage Dells & Tripp Ranch Meadow Open Spaces, 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 Heritage Dells & Tripp Ranch Meadow Open Spaces, Jefferson County, United States.
Pinaceae
Pinus scopulorum Lemmon. (Syn: P. ponderosa Laws. var. scopulorum Engelm. ) Rocky Mountain yellow pine. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6151.
6/1/2026.
.
 East slope of Tarryall Mountains from Camp Site 8. |
 Coll. No. 1316, Pinus |
 Rocky Mountain yellow pine on top of North Table Mountain. |
Anacardiaceae
Rhus trilobata Nutt. var. trilobata. (Syn: Rhus aromatica Aiton var. trilobata (Nutt.) A. Gray ex S. Watson ) Skunkbush Sumac. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4645. 4/23/2026. .
- Heritage Dells, South Gulch, 4502. 4/9/2026. 4509. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2738.
6/10/2022.
.
.
Toxicodendron rydbergii (Small ex Rydb.) Greene. Western Poison Ivy. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6149.
6/1/2026.
.
 Western Poison Ivy on the backbone of Dakota Ridge. |
Apiaceae
Conium maculatum L. Common Poison Hemlock. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4631. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3562.
6/8/2024.
.
.
 Coll. No. 1436, Conium maculatum |
Lomatium orientale J.M. Coult. & Rose. Salt-and-Pepper. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, to 20 cm., woody taproot; Leaves, compound, pinnate, 75 mm. × 26 mm. wide, ultimate divisions, ≤3 mm., ≤1 mm. wide, villous, tips, obtuse, (with a very small white “spine”); Inflorescence, compound umbel; Involucel Bracts, glabrous; Flowers, white; Anthers, red; Ovary, glabrous, stylopodium, absent; Fruit, 5 mm. × 3.5 mm. wide, ovate, glabrous, dorsally compressed, lateral ribs winged (Described from Coll. No. 1837, 17 May 2018).
- Heritage Dells, North Gulch, 4644. 4/23/2026. .
- Heritage Dells, South Gulch, 4492. 4/9/2026. 4505. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3563.
6/8/2024.
.
Asclepiadaceae
Asclepias speciosa Torr. Showy Milkweed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6136.
6/1/2026.
.
 Seed pod of Asclepias speciosa |
 Seed of Asclepias speciosa |
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).
- Tripp Ranch Meadow Open Space,
2746.
6/10/2022.
.
.
Ambrosia psilostachya DC. Western Ragweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm., woody at base; Leaves opposite below, alternate above, 50 mm. × 22 mm., ovate, pinnately divided; Inflorescence indeterminate, appearing raceme-like, 2 kinds of flowers, pistillate heads many, distal, carpellate heads few, clustered in distal leafy axils; Phyllaries fused into a cup; Receptacle not chaffy; Pappus absent (Described from Coll. No. 1068, 8 Oct 2014).
- Heritage Dells, South Gulch, 6114. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3564.
6/8/2024.
.
.
Antennaria . Pussytoes. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space, Tom Schweich 3565. 6/8/2024. . .
Artemisia dracunculus L. (Syn: Oligosporus dracunculus (L.) Poljakov ssp. glaucis (Pall. ex Willd.) A. Löve & D. Löve ) Tarragon, Dragonwort. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4625. 4/23/2026. .
- Heritage Dells, South Gulch, 6144. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2752.
6/10/2022.
.
.
 Coll. No. 1754, Artemisia dracunculus |
 Coll. No. 1754, Artemisia dracunculus |
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).
- Tripp Ranch Meadow Open Space,
2783.
6/10/2022.
.
.
 Coll. No. 1067, Artemisia frigida |
 Coll. No. 3507, Artemisia frigida. |
 Coll. No. 1067, Artemisia frigida |
 Coll. No. 1067, Artemisia frigida |
Artemisia ludoviciana Nutt. Silver Wormwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4616. 4/23/2026. .
- Heritage Dells, South Gulch, 4506. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2739.
6/10/2022.
.
.
 Something is parasitizing my Artemisia |
 Coll. No. 1281, Artemisia ludoviciana |
 Entire leaves of Coll. No. 1281, Artemisia ludoviciana |
Carduus nutans L. (Syn: Carduus nutans L. ssp. macrolepis (Peterman) Kazmi ) Nodding Plumeless Thistle. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, to 55 cm., tap-rooted, branched at base; Leaves, basal, withered at flowering, cauline, alternate, decurrent 40 mm. + blade 75 mm. × 25 mm. wide, pinnately lobed, margins spiny; Inflorescence, single heads on spiny tomentose peduncles 2.5-15 cm.; Phyllaries, many graduated series, 9-20 mm. × 1-3 mm. wide, thick at base, mostly green, purplish at margins, mid-vein prominent, tip spiny; Receptacle, alveolate (honeycombed), flat, bristly; Disk flowers, 25 mm., color purple; Pappus, capillary bristles, 18 mm. (Described from Coll. No. 1517, 24 July 2016.)
- Tripp Ranch Meadow Open Space,
Tom Schweich 3568.
6/8/2024.
.
.
 Carduus nutans rosette. |
 Coll. No. 1711, Carduus nutans |
 Coll. No. 2551, Carduus nutans |
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).
- Heritage Dells, North Gulch, 4647. 4/23/2026. .
- Heritage Dells, South Gulch, 4498. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2744.
6/10/2022.
.
.
 Coll. No. 1200, Cirsium arvense |
 Coll. No. 3210, Cirsium arvense. |
 Coll. No. 1512, Cirsium arvense |
 Coll. No. 2773, Cirsium arvense |
Crepis occidentalis Nutt. ssp. costata (A. Gray) Babcock & Stebbins. Largeflower Hawksbeard. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
Subspecies costata (A. Gray) Babcock & Stebbins, if infraspecific names are to be applied.
Small (1.7 ac) parcel deeded to the city as part of the Tripp Ranch development, sandwiched between Jefferson County Open Space, Stonebridge HOA open space, and private residences, accessed from Crawford St., 4.41 km. south of the GNIS location of Golden.
Tom Schweich 2793.
10 Jun 2022.
(
COLO2793388‡
)
.
.
 Coll. No. 3265, Crepis occidentalis ssp. costata. |
Ericameria nauseosa (Pall. ex Pursh) G.L.Nesom & G.I.Baird var. graveolens (Nutt.) Reveal & Schuyler. (Syn: E. n. (Pall. ex Pursh) G.L.Nesom & G.I.Baird var. glabrata (Gray) G.L. Nesom & Baird ) Goldy-Locks. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4598. 4/23/2026. 4615. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
2780.
6/10/2022.
.
.
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).
- Heritage Dells, South Gulch,
Tom Schweich 3590.
1 Jun 2026.
(
Undist.
)
.
.
Erigeron tracyi Greene. (Syn: E. cinereus A. Gray , E. colomexicanus A. Nelson , E. divergens Torrey & A. Gray var. cinereus A. Gray ) Running Fleabane. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, 20-25 cm., caudex simple (not stout) non-rhizomatous, hairy throughout, with hairs 0.2-0.4 mm. spreading in all directions, glandular at high magnification; Stem, some with prior year's branches assumed to have been stoloniferous; Leaves, basal and cauline, basal, petiole, to 26 mm. + blade oblanceolate 8-12-20 mm. × 2-4-5.5 mm. wide, short hairy and glandular (especially visible at high magnification), margin entire, tip acute, some withered at flowering time, cauline, ±sessile, reduced or not well-developed above, but up to 32 mm. × 1.8 mm. wide; Peduncle, spreading to descending multicellular hairs with clear crosswalls, slightly pustular (maybe) or glandular at high magnification; Phyllaries, in 2+ ±equal series, but not distinctly imbricate, 3-4.5 mm. × 0.7 mm. wide, lanceolate, green center, light margins, spreading hairy; Receptacle epaleate; Flowers, 2 kinds; Ray flowers, cypsela 0.5 mm. + tube 2 mm. + ligule 4 mm. × 0.3-0.6 mm. wide = 6.5-7 mm. × 0.8 mm. wide, fertile, tip rounded, white & pink fading purple; Disk flowers, yellow; Pappus, ray and disk alike, inner, few capillary bristles, 4 mm., outer, short crown of scales, double pappus not particularly disgnostic in Erigeron. The most common form of E. tracyi is perhaps (speculative) a stabilized, apomictic hybrid between E. flagellaris and E. divergens (FNANM). Described from Coll. No. 1133, 9 Jun 2015 and Coll. No. 1337, 11 May 2016.
- Heritage Dells, South Gulch, 6118. 6/1/2026. 6140. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2765.
6/10/2022.
.
.
Grindelia squarrosa (Pursh) Dunal. Curlycup Gumweed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2787.
6/10/2022.
.
.
 Obs. No. 4391, Grindelia squarrosa. |
 Obs. No. 4391, Grindelia squarrosa. |
 Obs. No. 4391, Grindelia squarrosa. |
 Grindelia squarrosa in my garden. |
Grindelia subalpina Greene. Subalpine Gumweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, 45-60 cm.; Stem, light brown, glabrous; Leaves, cauline, alternate, sessile, blade 45 mm. × 12 mm. wide, reduced distally, oblanceolate, adaxially glandular, margins, dentate, teeth separated 3-5 mm., apiculate; Inflorescence, heads, #3-4 per stem, not overtopped by leaves, showy, gummy exudate; Involucre, 10 mm. × 13 mm. wide, globose, resinous; Phyllaries, in 5± unequal graduated series, lower << rest of involucre, upper 8 mm. × 1.3 mm. wide, resinous, margins, flat, tips, acuminate, lower coiled 360°; Pappus, few, well developed bristles, 3.5 mm, readily falling; Style, 2-branched, stigmatic portion 0.6 mm. + appendages 0.6 mm.; Cypsela, 1.6 mm. × 0.6 mm. wide, black, glabrous. (Described from Coll. No. 3530, 18 September 2025.)
- Heritage Dells, North Gulch, 4612. 4/23/2026. .
- Heritage Dells, South Gulch,
6158.
6/1/2026.
.
.
 Obs. No. 4396, Grindelia subalpina. |
 Obs. No. 4392, Grindelia subalpina in DeLong Park. |
 Coll. No. 3530, Grindelia subalpina. |
Gutierrezia sarothrae (Pursh) Britton & Rusby. (Syn: G. linearifolia Lag. ) Broom Snakeweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, tap-rooted, to 9 cm.; Leaves, alternate, linear, 20 mm. × 1 mm. mm. wide, dotted with embedded oil glands, very few short hairs; Peduncle, 0.5-1.5 mm.; Inflorescence, some flowers with strap-shaped corollas, flowers of two kinds in same heads, Involucre, 3.5 mm. × 2.5-3.0 mm. wide, obconic, not gummy; Phyllary, 2-3 unequal series, inner folded around ovary of ray flowers, dotted with embedded oil glands, tips appressed; Receptacle, epaleate; Rays, #5, yellow; Disk, #4; Pappus, a well-developed crown of scales on both ray and disk flowers; (Described from Coll. No. 144, 3 Oct 1997: keys easily to Gutierrezia sarothrae. However, inner phyllaries are folded around ovary of ray flowers, a character not mentioned in keys or description.)
- Tripp Ranch Meadow Open Space,
2756.
6/10/2022.
.
.
Helianthus pumilus Nutt. Little Sunflower. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm.; Leaves, cauline, alternate, occasionally opposite, then bases conjoined, simple, petiole 7-10 mm. + blade 55-86 mm. × 22-30 mm. wide, lanceolate, flat (not folded), margin, entire to lightly toothed, adaxial, pustular strigose, hairs multicellular, crosswalls clear, abaxial, glandular and strigose; Inflorescence, heads single to few on leafy stems, peduncles to 8-10 cm., hairy, glandular; Involucre, 9 mm. × 16 mm. wide; Phyllaries in 2+ series, similar, 6-10 mm. × 2.0-3.5(4) mm. wide, greene erect, ovate, strigose abaxially, margins ciliate, tip acuminate, not as “stiff” or “tough” as those of Coll. No. 1199; Receptacle, slightly convex, paleate; Disk, 17 mm. wide; Palea, 9 mm., tip, glandular, hairy distally; Flowers, 2 kinds; Ray flowers, sterile, #10-12, corolla, 17-25 mm. × (4)6-9 mm. wide, yellow; Disk flowers, corolla, 4-6 mm., yellow, lobes, #5, 1 mm., yellow, anther appendages reddish-brown; Pappus of few long (2.5-4 mm.) aristate scales; Cypsela, 3.5 mm. × 1.4 mm. wide, quadrangular,not laterally compressed black. Described from Coll. No. 1210, 1426, and 1704.
- Heritage Dells, North Gulch, 4622. 4/23/2026. .
- Heritage Dells, South Gulch, 6123. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2751.
6/10/2022.
Tom Schweich 3567.
6/8/2024.
.
.
 Coll. No. 1704, Helianthus pumilus |
 Coll. No. 1426, Helianthus pumilis |
Heterotheca villosa (Pursh) Shinners. (Syn: H. v. (Pursh) Shinners var. nana (A. Gray) Semple , H. v. (Pursh) Shinners var. villosa ) Hairy False Goldenaster. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm.; Leaves, cauline alternate, entire, 1-veined, distal perpendicular to stems, hairs > glands; Heads solitary, with both ray and disk flowers; Phyllaries in 2+ series, unequal, to 7 mm.; Rays, 9 mm.; Pappus double, outer narrow scales ≤ 1 mm. (easier to see on mature fruit), inner bristles, 6.5 mm., white; Fruit, disk 3 mm., hairy.
- Heritage Dells, North Gulch, 4614. 4/23/2026. .
- Heritage Dells, South Gulch, 6112. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2777.
6/10/2022.
.
.
Hymenopappus filifolius Hook. var. polycephalus (Osterh.) B.L. Turner. Many-Headed Fine-Leaved Wooly-White. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 60 cm., ±tomentose throughout; Leaves, basal, petiole 35 mm. + blade 75-105 mm. × 30-50 mm. wide, oblanceolate in shape, base conspicuously tomentose, bipinnately dissected to filiform segments, ultimate leaf divisions (8)12-19 mm., cauline, similar, reduced above, #(4)5-8; Inflorescence, heads borne singly on peduncles, 22-45 mm.; Heads, (5)7-16 per stem; Involucre, 8 mm. × 15 mm. wide; Phyllaries, 1-2 series (vague what is a series and what not), 6-7 mm. × 2.5-4.0 mm. wide, inner > outer, green, tomentose, margins chartaceous, tips broad; Receptacle, epaleate, flat; Flowers, 1 kind; Disk flowers, corollas, 3.5 mm., yellow; Pappus, crown of scales, 0.8-1.2 mm.; Cypsela, 3-5 mm., hairy all over, more so on the angles. (Described from Coll. No. 1427, 15 June 2016, and Coll. No. 1504, 13 July 2016.)
- Tripp Ranch Meadow Open Space,
2766.
6/10/2022.
.
.
Lactuca serriola L. Prickly Lettuce. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual herb, Stems erect, Leaves basal 0 at flowering, cauline coarsely lobed, margins prickly-toothed, Fruit beak slender, many-ribbed, ~8 adaxial, ~5 abaxial (Described from Collection No. 911, 4 Oct 2012).
- Heritage Dells, South Gulch,
6125.
6/1/2026.
.
.
 Coll. No. 1749, Lactuca serriola |
 Coll. No. 3478, Lactuca serriola. |
Senecio integerrimus Nutt. Columbia Ragwort. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2743.
6/10/2022.
a couple of dense patches, competing with Canada thistle.
Tom Schweich 3569.
6/8/2024.
.
.
Taraxacum officinale F. H. Wigg. (Syn: T. laevigatum (Willd.) DC. ) Common Dandelion. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4629.
4/23/2026.
.
.
Tragopogon dubius Scop. (Syn: Tragopogon dubius Scop. ssp. major (Jacq.) Vollman ) Yellow Salsify. CalPhotos. Jepson eFlora. SEINet Taxon.
Peduncle inflated distally, flowers yellow, phyllaries in 1 overlapping series, ligules 3-5 mm. shorter than phyllaries.
- Tripp Ranch Meadow Open Space,
2774.
6/10/2022.
.
 Coll. No. 1115, Tragopogon dubius |
Boraginaceae
Cynoglossum officinale L. Gypsyflower. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4610. 4/23/2026. .
- Heritage Dells, South Gulch, 4497. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2745.
6/10/2022.
.
.
Hydrophyllum fendleri (A. Gray) A. Heller var. fendleri. Fendler's Waterleaf. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4640. 4/23/2026. .
- Tripp Ranch Meadow Open Space, Tom Schweich 3570. 6/8/2024. . .
Lithospermum occidentale (Mack.) Weakley, Witsell & D. Estes. (Syn: Onosmodium bejariense DC. ex A. DC. var. occidentale (Mack.) B. L. Turner , Onosmodium molle Michx. ) Western Marbleseed. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6152. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3571.
6/8/2024.
.
.
 Coll. No. 2107, Lithospermum occidentale |
 Gynobase of Lithospermum occidentale |
 Lithospermum occidentale on the west side of Green Mountain |
Mertensia lanceolata (Pursh) DC. Prairie Bluebells. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, with spreading-ascending branches to 20 cm.; Stem, glabrous; Leaves, basal and cauline, basal, petiole 55 mm. + blade 50 mm. × 12.5 mm. wide, lanceolate, distinct lateral veins, papillate adaxially, margin, entire, appressed ciliate; cauline, sessile, 40 mm. × 4 mm. wide, without distinct lateral veins, papillate to strigose (oriented toward apex) adaxially, margin, entire, appressed ciliate; Inflorescence, panicle; Calyx, not divided to base, tube 1.5 mm. + lobes 2-3 mm.; Corolla, tube 4.0-6.5 mm. + lobes 4.5-7.5 mm., free 2.0 mm., limb 5-10 mm., deciduous, blue, small tufts or a ring of hairs near (2.2 mm.) base of throat; Stamens, #5-6, inserted, attached just below (0.5 mm.) throat/fornices; Filaments, 2.0-3.5 mm., strap-shaped, filaments ≥ anthers; Anthers, 1.8-2.3 mm., versatile, yellow; Ovary, 0.7 mm. × 1.3 mm. wide, partially fused to calyx; Style, 7.0-7.5 mm., single, ±≥anthers; Stigma, simple; Fruit, #4 nutlets, 1.7 mm. × 1.5 mm. wide. (Described from Coll. Nos. 1906 & 2035.)
- Heritage Dells, North Gulch, 4649. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
2759.
6/10/2022.
.
Brassicaceae
Alyssum simplex Rudolphi. (Syn: A. campestre (L.) L. var. simplex (Rudolphi) Willd. , A. minus Rothm. , A. parviflorum Fisch. ex M.Bieb. ) European Madwort. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, tap-rooted, to 12-30 cm., stellate hairy throughout (typically doubly branched and 8-pointed); Stem branched at base, ascending; Leaves basal, withered at flowering, appear compound, cauline, alternate, 14-28 mm. × 3.5-5.0 mm., oblanceolate, margin entire, tip acute, sessile or vaguely short-petioled; Inflorescence not bracted; Pedicels, in fruit, 4.5 mm.; Sepals, 4, 2 mm. × 0.7 mm. wide, deciduous in fruit; Petals 2.9-3.0 mm., yellow fading white,clawed, entire to tip slightly notched; Stamens, 2.5-2.6 mm.; Filaments, 2.3 mm., winged proximal 1.5-1.8 mm., not toothed; Style persistent, 1.3 mm., few hairs at base; Fruit round, 3.5-5.0 mm. × 5.6 mm. wide, margin entire, compressed parallel to the replum, hairy, hairs thinning as fruit matures; Ovules, 4 (most keys and descriptions say 2 when they give a specific number, but the genus is described as having 1-2[4] ovules). (Described from Clyde Golden, 25 Jun 2011, Coll. No. 1090, 30 Apr 2015, and Coll. No. 1367, 24 May 2016).
- Heritage Dells, North Gulch, 4620. 4/23/2026. .
- Heritage Dells, South Gulch, 6124. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2747.
6/10/2022.
.
.
 Alyssum simplex |
 Alyssum simplex |
 Fruit of Coll. No. 1090, Alyssum simplex |
 Coll. No. 1090, Alyssum simplex |
 Coll. No. 1367, Alyssum simplex |
Camelina microcarpa Andrz. ex DC. Little-Podded False Flax. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, terrestrial, herb, 45 cm. to 80 cm. tall; Stem, erect, mostly single, some branched mid-stem, proximal, simple and forked hairs, distal, glabrous; Leaves, basal, absent or withered, cauline, #11-25, sessile, distal basally lobed 1.2 mm., 26-62 mm. × 6.5-10 mm. wide, reduced above, lanceolate, hairs simple and forked; Inflorescence, to 220 mm. × 35 mm. wide, not bracted, not one-sided; Flowers, radial; Pedicels, 4-8 mm., glabrous; Sepals, #4, rows, #1, 2.4-2.7 mm. × 0.8-1 mm. wide, ovate, color, green, margin chartaceous, tip purplish, abaxially hairy; Petals, 3.7-4.0 mm. × 0.7-0.9 mm. wide, oblong-spatulate, margin, entire, color, yellow; Stamens, #6, 3 mm.; Filaments, plain or maybe very narrowly winged; Anthers, 0.7 mm., ovate; Ovary, 1.8 mm. × 0.9 mm. wide; Style, 0.8 mm.; Stigma, capitate, 0.4 mm. wide; Fruit (mature), pedicels, 15 mm., 3 × than fruit, spreading, 5 mm. × 3.2-3.5 mm. wide, wider above middle, somewhat flattened, parallel to replum, coriaceous, short-winged (or strong-margined), valve mid-vein apparent but not prominent; Seeds, many, 1.0 mm. × 0.7 mm. wide, angled, papillate (Described from Coll. No. 1876 and 1883).
- Tripp Ranch Meadow Open Space,
Tom Schweich 3573.
6/8/2024.
.
.
 Coll. No. 1876, Camelina microcarpa |
 Coll. No. 2936, Camelina microcarpa. |
Hesperis matronalis L. Dame's Rocket. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm., hairs, forked on stem, leaf, and sepal, but not fruit; Leaves, basal, withered at flowering, cauline, petiole 3-5 mm. + blade 100 mm. × 35 mm. wide, lanceolate, margin, small-toothed; Inflorescence, raceme; Sepals, #4, 5-6 mm., green, margins purple; Petals, #4, 13 mm. × 4 mm. wide, clawed, purple; Fruit, silique, 40 mm. × 0.6 mm. wide; Seed, 1.7 mm., brown, glabrous (Described from Coll. No. 1441, 15 June 2016).
- Heritage Dells, North Gulch, 4608. 4/23/2026. .
- Heritage Dells, South Gulch,
6132.
6/1/2026.
.
.
 Hesperis matronalis in the ditch. |
 What the well-dressed botanist wears while chasing noxious weeds in the grass. |
 Coll. No. 1441, Hesperis matronalis |
 Coll. No. 2808, Hesperis matronalis |
Thlaspi arvense L. Field Penny Cress. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual, tap-rooted, to 50 cm., generally glabrous throughout; Stem, single, or few-branched proximally; Leaves, basal and cauline, basal, withered at flowering, cauline, sessile, auriculate, oblong, 30 mm. × 5-9 mm. wide, reduced distally, dentate; Inflorescence, raceme; Sepals, 2 mm. × 1 mm. wide, ovate; Petals, 3-3.5 mm. × 1 mm. wide, spoon-shaped, margin entire, white; Stamens, 2 mm.; Anthers, 0.5 mm.; Fruit, pedicels 10-15 mm., ascending to spreading, glabrous, fruit obovate, 10 mm. × 8 mm., wide, margin winged, tip notched 1 mm.; Ovules, biseriate, #many (Described from Coll. No. 1324, 4 May 2016).
- Heritage Dells, North Gulch, 4609. 4/23/2026. .
- Heritage Dells, South Gulch,
4500.
4/9/2026.
.
.
 Brassicaceae Thlaspi arvense |
 Habitat of Coll. No. 1365, Thlaspi arvense |
 Coll. No. 1365, Thlaspi arvense |
 Coarsely dentate leaves of Coll. No. 1820, Thlaspi arvense |
Turritis glabra L. (Syn: Arabis glabra (L.) Bernhardi ) Tower Rockcress. CalPhotos. Jepson eFlora. SEINet Taxon.
Short-lived (?) perennial, terrestrial, herb, 45 cm. to 90 cm. tall; Roots, tap. Stem, erect, #1, (1 of 4 specimens has 2 stems), leafy, proximal, simple and forked hairs, distal, glabrous; Leaves, basal and cauline, basal simple, petiole, 6 mm., blade, 60 mm. × 15 mm. wide, oblanceolate, hairs, simple and forked, margin, dentate, tip, obtuse; cauline, #20, sessile, lobed, 2.5 mm., 40 mm. × 10 mm. wide, lanceolate, reduced above, margin, entire, becoming glabrous distally; Inflorescence, raceme, 70 mm. × 11 mm. wide, not bracted, not one-sided; Pedicels (at anthesis), 3-4 mm., glabrous; Sepals, #4, 2.5 mm. × 1.1 mm. wide, ovate, green, margin chartaceous; Petals, 4.5 mm. × 0.7 mm. wide, spatulate, margin entire, color, pinkish, fading lavender; Fruit, (24-) 80-85 mm. × 0.9 mm. wide, ascending-appressed, glabrous, flattened, parallel to replum, style, base 0.4-0.5 mm. wide, stigma, 0.8-0.9 mm. wide; Ovules, biseriate, many, 0.7 mm. × 0.3 mm. wide, tan, translucent, wing not apparent. (Described from Coll. No. 1887, 28 May 2018).
- Heritage Dells, South Gulch, 6137. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3572.
6/8/2024.
.
 Coll. No. 1887, Turritis glabra |
Cactaceae
Cylindropuntia imbricata (Haw.) F. M. Kunth. Tree Cholla. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, Middle Gulch,
4516.
4/9/2026.
.
.
 Obs. No. 4312, Cylindropuntia imbricata. |
Escobaria missouriensis (Sweet) D.R.Hunt. (Syn: Coryphantha missouriensis (Sweet) Britton & Rose ) Missouri Foxtail Cactus. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2770.
6/10/2022.
.
.
Opuntia macrorhiza Engelm. Western Pricklypear. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial cactus, not distinctly mat-forming; Stem, segments, 90 mm. × 60 mm. wide, flattened, bluish-green, areoles, #5-6 per diagonal row, spaced 8-14 mm., proximal, glochids only, distal, glochids and spines, spines, #2, #1, 28 mm., erect, brown to tan at tip, #1, 12 mm., recumbent, nearly white; Flowers, petals, 36 mm. × 22 mm. wide, wedge-shaped, color yellow; Stamens, many, 18 mm., yellow; Style, 20-24 mm., stout; Stigma, lobes, #6-8, 3 mm.; Fruit, 38 mm. × 17 mm. wide, narrow at base, fleshy, green, areoles, mix of glochids and short spines. (Described from Coll. No. 1948, 15 June 2018.)
- Heritage Dells, North Gulch, 4617. 4/23/2026. .
- Heritage Dells, South Gulch, 6126. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2778.
6/10/2022.
.
.
 Coll. No. 2371, Opuntia macrorhiza |
 Opuntia macrorhiza on Schweich Hill. |
 Obs. No. 1540, Opuntia macrorhiza |
 Coll. No. 1948, Opuntia macrorhiza |
Opuntia polyacantha Haw. Plains Pricklypear. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6153. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2788.
6/10/2022.
.
Caprifoliaceae
Symphoricarpos occidentalis Hook. Western Snowberry. CalPhotos. Jepson eFlora. SEINet Taxon.
Woody perennial to 50 cm., forming dense colonies in moist open swales, [spreading by long sparsely-branched rhizomes,] Twigs without lenticels, minutely hairy when young; Leaves opposite, ovate, to 7 cm. × 5 cm. wide, reduced above, thick, approaching leathery, pinnately veined, upper surface glabrous, lower few short white hairs, margin slightly wavy, slightly rolled under, sparsely curved hairy; Petioles to 7 mm.; Inflorescence axillary (and terminal?); Floral bracts triangular, 3 mm.; Flowers in dense axillary clusters, bisexual, ±radial, possibly slightly bilateral, 2 or more whorls; Corolla fused at base, tube 2-3 mm., throat with recurved hairs, lobes 5, 2.0-3.5 mm, slightly longer than tube, hairy within at level of stamen insertion, white with magenta mottling; Stamens 5, alternate, exserted or barely exserted; Filaments, 3.3-3.6 mm., tapered; Anthers versatile; Ovary inferior Pistil 1; Style exserted or barely exserted; Stigma entire; Fruit a berry, green when young, mature color and size unknown. (Described from specimen seen on Green Mountain, 2 August 2014 and Coll. No. 1252, 26-Jul-2015).
- Heritage Dells, North Gulch, 4604. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
2773.
6/10/2022.
.
Caryophyllaceae
Cerastium arvense L. ssp. strictum Gaudin. (Syn: Cerastium strictum L ) Field Chickweed. CalPhotos. Jepson eFlora. SEINet Taxon.
Common early-flowering perennial, to 20 cm.; Leaves, opposite, broadly linear, 15 mm. × 3 mm. wide, stipules absent, tufts of leaves in lower axils; Sepals free; Petals >> sepals, white, notched; Styles (4)5.
- Heritage Dells, North Gulch, 4643. 4/23/2026. .
- Heritage Dells, South Gulch, 4501. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2781.
6/10/2022.
.
Chenopodiaceae
Chenopodium album L. Lambsquarters. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4603. 4/23/2026. .
- Heritage Dells, South Gulch,
6131.
6/1/2026.
.
 Coll. No. 1750, Chenopodium album |
 Coll. No. 3203, Chenopodium album. |
 Coll. No. 1750, Chenopodium album |
Convolvulaceae
Convolvulus arvensis L. Field Bindweed. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4613. 4/23/2026. .
- Heritage Dells, South Gulch, 6116. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2755.
6/10/2022.
.
 Habitat of Coll. No. 1220, Convolvulus arvensis |
 Coll. No. 1220, Convolvulus arvensis |
Cornaceae
Cornus sericea L. ssp. sericea. (Syn: C. stolonifera Michaux ) Creek Dogwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, Middle Gulch,
4518.
4/9/2026.
.
 Coll. No. 3401, Cornus sericea ssp. sericea. |
 Coll. No. 698, Cornus sericea ssp. sericea |
Crassulaceae
Sedum lanceolatum Torr. (Syn: Amerosedum lanceolatum (Torr.) A. Löve & D. Löve ) Spearleaf Stonecrop. CalPhotos. Jepson eFlora. SEINet Taxon.
Type collected by Edwin James on the Long Expedition, described by Torrey, 1827.
- Tripp Ranch Meadow Open Space,
2775.
6/10/2022.
.
Elaeagnaceae
Elaeagnus angustifolia L. Russian Olive. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4600.
4/23/2026.
.
 Coll. No. 1645, Elaeagnus angustifolia |
 Coll. No. 1437, Elaeagnus angustifolia |
Euphorbiaceae
Euphorbia myrsinites L. (Syn: Tithymalus myrsinites (L.) Hill ) Myrtle Spurge. Weed: CO DofA, List: A. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
4499.
4/9/2026.
.
Fabaceae
Astragalus drummondii Dougl. ex Hook. Drummond's Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 35 cm., caulescent; Stem, rachis, abaxial leaf surfaces, and calyx spreading hairy, hairs basifixed; Leaves, cauline, compound, odd-pinnate, stipules, 9 mm., free, entire, leaflets, 23-27, 19 mm. × 5.5 mm. wide, wavy hairy abaxially and marginally, ±glabrous adaxially; Calyx, tube 6 mm. + lobes 3 mm. = 9 mm., green at base to cream color at tube and lobes, few dark wavy hairs, persistent; Corolla, 17 mm., color cream, banner, 17 mm., wings, claw 6 mm. + blade 9 mm., tip obtuse, keel, 14 mm., tip purple, Ovary, 9 mm.; Style, 4 mm., glabrous, persistent; Fruit, stalked 12 mm. + body 26 mm. × 4 mm. wide, pendant, smooth, glabrous, not inflated. Described from Coll. No. 1141, 9 Jun 2015.
- Tripp Ranch Meadow Open Space,
2757.
6/10/2022.
.
.
 Coll. No. 1141, Astragalus drummondii |
 Flower of Coll. No. 1141, Astragalus drummondii |
 Fruit of Coll. No. 1141, Astragalus drummondii |
 Inflorescence of Coll. No. 1141, Astragalus drummondii |
Astragalus flexuosus G. Don. Flexible Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb,
decumbent to ascending stems,
to 30-50 cm., not vine-like, caulescent, appressed basifixed hairy throughout;
Leaves, cauline, compound, odd pinnate, leaflets ±15-17,
terminal leaflet not modified into tendril,
stipules, entire, not lobed at base,
not connate (slightly) connate on side opposite to petiole,
leaflets, 11-12 mm. × 2-4 mm. wide, oblong, notched,
terminal leaflet 7 mm. < uppermost pair 8 mm.;
Inflorescence, raceme, arising from axils;
Calyx, 4 mm., tube >> lobes,not inflated in fruit;
Flower, zygomorphic,
banner, 9 mm.,
wings (2), 9 mm.,
keel, 5.5 mm., <wings, not beaked;
Style, 3 mm., glabrous, persistent;
Fruit, 9 mm. × 4.5 mm.,
substipitate 1 mm.,
not inflated,
compression lateral
sparse appressed hairs.
Described from Coll. No. 1148, 15 Jun 2015, and Coll. No. 1384, 1 June 2016.
- Heritage Dells, South Gulch, 6142. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2758.
6/10/2022.
.
.
Astragalus laxmannii Jacq. var. robustior (Hook.) Barneby & S. L. Welsh. (Syn: Astragalus adsurgens Pall. ) Prairie Milkvetch. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 40 cm., caulescent, ascending, hairs dolabriform; Leaves, cauline, stipules, free, 12 mm., compound, petiole, 5 mm., blade, 100 mm., leaflets, #17-21, 17-21 mm. × 5 mm. wide, elliptic, tip cuspidate, terminal leaflet jointed to rachis; Inflorescence, raceme, dense, bracts, 9 mm., 30+ flowers, ascending, Calyx, tube 4.5-6 mm. + lobes 5 mm. = 11 mm., hairs, black and white, dolabriform; Flowers, 14 mm., pale blue-lavender to whitish, banner, 14 mm, wings, claw 6 mm. + blade 6 mm. keel, 11 mm.; Ovary, 4.5 mm. × 1.3 mm. wide, densely hairy, Legume, more erect than flower (Described from Coll. No. 1400, and 3261).
- Tripp Ranch Meadow Open Space,
Tom Schweich 3574.
6/8/2024.
.
.
 Coll. No. 3160, Astragalus laxmannii var. robustior. |
 Coll. No. 1400, Astragalus laxmannii var. robustior |
Lupinus argenteus Pursh var. argenteus. Loosely Flowered Silver Lupine. CalPhotos. Jepson eFlora. SEINet Taxon.
Characters observed while keying: Perennial > 1 dm, stem hairs appressed, leaves cauline, petioles 4-4.5mm, calyx spurred <= 1 mm, banner back hairy, keel upper margin ciliate distal half. Most of the Lupinus argenteus in Golden are var. argenteus.
- Heritage Dells, South Gulch, 6143. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2748.
6/10/2022.
Dry (-ish) northeast-facing slope. Also here: Artemisia ludoviciana, Helianthus pumilis, Heterotheca villosa, Linaria dalmatica, Eriogonum umbellatum, Rosa arkansana, and Koeleria macrantha.
High mixed-grass prairie at base of Rocky Mountain Front Range.
Very small (1.67 ac.) City of Golden-owned open space, adjacent to Jefferson County Open Space (Apex Park) and Stonebridge HOA common area, accessed by narrow passage from Crawford Street, 3.44 km. south of the GNIS location of Golden.
Tom Schweich 3246.
8 Jun 2024.
(
UCR
x-CDA
)
.
.
Medicago lupulina L. Black Medick. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual herb, prostrate, to 1 cm. × 50 cm. wide; Leaves, compound, stipules, leaf-like, 6.5 mm., petioles, 11 mm., leaflets, #3, obovate, 5 mm. × 5-6 mm. wide, margin denticulate, middle leaflet extended beyond lateral leaflet on a petiolule; Inflorescence, compact axillary raceme, 8 mm. × 3.5 mm. wide; Sepals, 1 mm.; Flowers, 2 mm., color yellow; Fruit, unknown -- should be curved (Described from Coll. No. 1803, 7 May 2018).
- Heritage Dells, South Gulch,
6139.
6/1/2026.
.
.
 Coll. No. 1803, Medicago lupulina. |
 Coll. No. 1803, Medicago lupulina |
 Coll. No. 1803, Medicago lupulina |
 Coll. No. 1803, Medicago lupulina |
Medicago sativa L. Alfalfa. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6122. 6/1/2026. .
- Tripp Ranch Meadow Open Space, 2790. 6/10/2022. . .
Melilotus officinalis (L.) Lam. Yellow Sweet Clover. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6134. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2779.
6/10/2022.
.
.
 Inflorescence of Coll. No. 1687, Melilotus officinalis |
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).
- Tripp Ranch Meadow Open Space,
2769.
6/10/2022.
.
.
 Purple Locoweed (Oxytropis lambertii) on top of North Table Mountain. |
 Coll. No. 1385, Oxytropis lambertii |
 Coll. No. 3415, Oxytropis lambertii. |
Pediomelum tenuiflorum (Pursh) A. N. Egan. (Syn: Psoralea tenuiflora Pursh , Psoralidium tenuiflorum (Pursh) Rydb. ) Slimflower Scurfpea. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2768.
6/10/2022.
.
.
 Pediomelum tenuiflorum |
 Pediomelum tenuiflorum |
Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richardson var. divaricarpa (A. Nelson) Isely. (Syn: Thermopsis divaricarpa A. Nelson ) Spreadfruit Goldenbanner. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, Middle Gulch, 4515. 4/9/2026. .
- Heritage Dells, South Gulch, 4491. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3576.
6/8/2024.
.
Geraniaceae
Erodium cicutarium (L.) L'Her. ex Aiton. Hemlock-leav'd Crane's-bill. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4627. 4/23/2026. 4654. 4/23/2026. .
- Heritage Dells, South Gulch,
6113.
6/1/2026.
.
 Coll. No. 349, Erodium cicutarium |
 Coll. No. 1790, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
 Coll. No. 2063.3, Erodium cicutarium |
Grossulariaceae
Ribes aureum Pursh. Golden Currant. CalPhotos. Jepson eFlora. SEINet Taxon.
Coll. No. 1319, 4 May 2016: Perennial shrub, to 1 m.; Stem, unarmed; Leaves, fascicled, broadly ovate, 29 mm. × 22 mm. wide, lobes 3, obtuse; Hypanthium, 9 mm., bright yellow; Sepals, petaloid, 5 mm.; Petals, 2.5 mm.; Ovary, 2 mm.
- Heritage Dells, North Gulch, 4636. 4/23/2026. .
- Heritage Dells, South Gulch, 4507. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3578.
6/8/2024.
.
.
 Habitat of Coll. No. 1834, Ribes aureum. |
 Grossulariaceae Ribes aureum |
 Grossulariaceae Ribes aureum |
 Ribes aureum in winter. |
 Twigs of Ribes aureum in winter. |
 Coll. No. 1834, Ribes aureum. |
Ribes cereum Douglas. Wax Currant. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4599. 4/23/2026. .
- Heritage Dells, South Gulch, 6150. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2772.
6/10/2022.
.
 Developing fruit on Ribes cereum. |
 Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1092, Ribes cereum |
Lamiaceae
Salvia L. Sage. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4630. 4/23/2026. . .
Salvia . Horticultural Salvia. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6147. 6/1/2026. . .
Scutellaria brittonii Porter. Britton's Skullcap. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
dry red soil near western boundary
Tom Schweich 3575.
6/8/2024.
.
.
Stachys byzantina K. Koch. Lamb's Ear. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4628. 4/23/2026. .
Linaceae
Linum lewisii Pursh. (Syn: Adenolinum lewisii (Pursh) A. Löve & D. Löve ) Prairie Blue Flax. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2763.
6/10/2022.
.
 Coll. No. 3119, Linum perenne. |
 Coll. No. 823, Linum lewisii |
 Coll. No. 1383, Linum perenne |
 Inflorescence of Coll. No. 1951, Linum lewisii |
Malvaceae
Malva neglecta Wallr. Common Mallow. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6157. 6/1/2026. . .
Sphaeralcea coccinea (Nutt.) Rydb. Cowboy's Delight. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2753.
6/10/2022.
.
 Sphaeralcea coccinea (Nutt.) Rydb. On the lowest slopes of North Table Mountain. |
 Coll. No. 1423, Sphaeralcea coccinea |
Oleaceae
Syringa vulgaris L. Common Purple Lilac. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4632. 4/23/2026. 4646. 4/23/2026. .
Onagraceae
Oenothera suffrutescens (Ser.) W. L. Wagner & Hoch. (Syn: Gaura coccinea Pursh , Gaura glabra Lehm. ) Linda Tarde. CalPhotos. Jepson eFlora. SEINet Taxon.
Herbaceous perennial, to 60 cm.; Stipules absent; Leaves alternate, 25 mm. x 5 mm., lanceolate, few toothed; Inflorescence straight, open; Bracts 2-3 mm.; Buds erect; Sepals fused to tip in bud, all coming free, reflexed, 6 mm., not persistent after flowering; Hypanthium 6 mm.; Petals entire; Stamens 8, < stigma; Anthers maturing in unison with stigma; Ovary at flowering > distal internode (ergo infl. "open"); Stigma 4-lobed; Fruit 7 mm., stalk-like base 0, erect, fusiform, gradually wider at middle, puberulent, indehiscent; Seeds few, 2 mm., glabrous, not winged (Decribed from Coll. No. 317, keyed 15 Dec 2012).
- Tripp Ranch Meadow Open Space,
2764.
6/10/2022.
.
 Coll. No. 317, Oenothera suffrutescens |
 Inflorescence of Coll. No. 1147, Oenothera suffrutescens |
 Overview of Coll. No. 1147, Oenothera suffrutescens |
 Coll. No. 1866, Oenothera suffrutescens |
Orobanchaceae
Castilleja integra A. Gray. Wholeleaf Indian Paintbrush. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6145. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3579.
6/8/2024.
.
Papaveraceae
Argemone polyanthemos (Fedde) G.B. Ownbey. Crested Prickly Poppy. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6127.
6/1/2026.
.
Plantaginaceae
Linaria dalmatica (L.) Mill. (Syn: Linaria dalmatica (L.) Mill. ssp. dalmatica , Linaria genistifolia (L.) Mill. ssp. dalmatica (L.) Maire & Petitm. ) Dalmatian ToadFlax. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4621. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
2762.
6/10/2022.
.
.
Penstemon secundiflorus Benth. Sidebells Penstemon. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
Tom Schweich 3581.
6/8/2024.
.
.
Penstemon virens Pennell ex Rydb. Front Range Beardtongue. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2776.
6/10/2022.
.
Polygonaceae
Eriogonum effusum Nuttall, Proc. Acad. Nat. Sci. Philadelphia. 4: 15. 1848. Spreading Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, woody at base, to 30 cm., Stem, floccose; Leaves, cauline, petiole 5 mm. + blade 20-25 mm. × 2-6 mm. wide, generally tomentose, except less so adaxially, ±flat, margin entire, , withered at flowering; Inflorescence, open cyme; Involucre, 1 per node, 2 mm., tomentose; Perianth, without stipe; Tepals, 1.8 mm., white to pink, described as yellow in Ackerfield (2015) and FNAMN; Achene, unknown. (Described from Coll. No. 1507.1, 22 Jul 2016, Coll. Nos. 1537 & 1541, 18 Aug 2016.)
- Tripp Ranch Meadow Open Space,
Tom Schweich 3583.
6/8/2024.
.
.
 Eriogonum effusum along trail at Red Rocks |
 Eriogonum effusum along trail at Red Rocks |
 Voucher of Coll. No. 2431.1, Eriogonum effusum |
 Coll. No. 3192, Eriogonum effusum. |
Eriogonum umbellatum Torr. var. umbellatum. Sulphur-Flower Buckwheat. CalPhotos. Jepson eFlora. SEINet Taxon.
Type collected “near the Rocky Mountains” by Edwin James, 1820. Described by Torrey in 1827.
- Tripp Ranch Meadow Open Space,
2749.
6/10/2022.
.
.
Rumex crispus L. Curley Dock. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4605. 4/23/2026. 4653. 4/23/2026. .
- Heritage Dells, South Gulch, 4496. 4/9/2026. 6121. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3582.
6/8/2024.
.
 Coll. No. 2817, Rumex crispus |
 Coll. No. 818, Rumex crispus |
Ranunculaceae
Delphinium nuttallianum Pritz. Twolobe Larkspur. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4642.
4/23/2026.
.
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.
- Heritage Dells, South Gulch, 4503. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2771.
6/10/2022.
.
.
Cotoneaster lucidus Schltdl. Hairy Stem Cotoneaster. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6135.
6/1/2026.
.
.
 Where I found Cotoneaster lucidus -- thanks to Cindy. |
 Coll. No. 2315, Cotoneaster lucidus |
Crataegus erythropoda Ashe. Cerro Hawthorn. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4611.
4/23/2026.
4651.
4/23/2026.
.
.
 Coll. No. 2930, Crataegus erythropoda. |
Drymocallis fissa (Nutt.) Rydb. (Syn: Potentilla fissa Nutt. ex Torr. & A.Gray ) CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial, herb, caespitose, to 20 cm., terrestrial, not stoloniferous, rhizomatous, glandular-hairy throughout; Stem, erect, green, multicellular viscid hairs; Leaves, basal, 58-125 mm. × 16-26 cm. wide, pinnately compound, leaflets, #11; cauline, #3-4 per stem, alternate, stipules, 5 mm. × 2 mm. wide, lanceolate, entire to once shallowly toothed; petiole, 18 mm., prior years remaining on plant (as sometimes described for P. rupincola), multicellular viscid hairs, leaflets, #7-13, 40-51 mm. × 20-22 mm. wide, petiolulate (not decurrent), 12 mm. × 9 mm. wide, viscid hairy, terminal leaflet (8)10 mm. side, margin, flat, serrate, teeth, 4-6 per side, on distal ¾, tip dark reddish; Inflorescence, congested cyme, with 5-7 flowers; Flowers, limb, 15 mm.; Calyx, lobes, #5, 7-11 mm. × 2.7-4.5 mm. wide, fused ±½, viscid hairy, epicalyx bractlets, 3-5 mm. × 0.8-1.3 mm. wide, ±½ sepals; Receptacle, hairy, <1 mm., Petals, 7-9 mm. × 5-9 mm. wide, obovate, color yellow; Stamens, >25; Anthers, 1.4 mm. × 1 mm. wide; Ovaries, many, superior, glabrous; Styles, widest at middle, or thickest at base, tapered from middle, attached laterally below top of ovary; Stigma, #1; Achenes, glabrous. (Described from Coll. No. 1364, 21 May 2016, and Coll. No. 1911, 31 May 2018).
- Heritage Dells, North Gulch, 4639. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
2782.
6/10/2022.
.
.
 Coll. No. 1099, Drymocallis fissa |
 Coll. No. 1099, Drymocallis fissa |
 Coll. No. 1911, Drymocallis fissa |
Malus domestica (Suckow) Borkh. Common Apple. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4601.
4/23/2026.
.
.
 Flowers of Coll. No. 3548, Malus domestica. |
 Coll. No. 3548, Malus domestica. |
 Coll. No. 3548, Malus domestica. |
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).
- Tripp Ranch Meadow Open Space,
2789.
6/10/2022.
On ridge near top of and entrance to parcel. Also here: Artemisia frigida, Artemisia ludoviciana, Grindelia squarrosa, Senecio integerrimus, Opuntia macrorhiza, O. polyacantha, Eriogonum umbellatum, Cercocarpus montanus, and Potentilla fissa
High mixed-grass prairie at base of Rocky Mountain Front Range.
Very small (1.67 ac.) City of Golden-owned open space, adjacent to Jefferson County Open Space (Apex Park) and Stonebridge HOA common area, accessed by narrow passage from Crawford Street, 3.44 km. south of the GNIS location of Golden.
Tom Schweich 3247.
8 Jun 2024.
(
EIU
FLD
)
.
.
Potentilla L. Cinquefoil. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
palmate leaves
4495.
4/9/2026.
.
.
 Accidental Coll. No. 1473.1, Potentilla sp. |
Potentilla recta L. Sulphur Cinquefoil. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial herb, to 50 cm., hairy throughout, short (0.3 mm.) hairs glandular, long (4 mm.) hairs straight spreading eglandular; Leaves, stem, 7-8 per stem, alternate, stipules, to 20 mm., lobed, petioles, to 80 mm., blade, palmately compound, leaflets, #5, 45 mm. × 14 mm. wide, lobed ½ to mid-rib, progressively reduced above; Calyx, 9 mm. × 9 mm. wide, flattened at base; Petals, 8 mm., yellow; Style, 1.3 mm., tapered throughout, not appearing warty; Achene, 1 mm., attached laterally, reticulate in color, but not texture. Described from Coll. No. 1680, 28 June 2017. “The long, stiff, spreading, tubercle-based hairs on stems and petioles of P. recta, overtopping a layer of short hairs and glands, also serve to distinguish this aggressive species from native P. gracilis at any stage of the life cycle (FNANM).”
- Heritage Dells, South Gulch, 6146. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3585.
6/8/2024.
.
.
 Coll. No. 1680, Potentilla recta |
Prunus americana Marshall. American Plum. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial woody shrub, spreading, to 2 m., blooming before leafing out; Branches, unarmed, glabrous when young, peeling to brown; Leaves, (immature, at time of flowering), simple, 15-19 mm. × 5.5-8 mm. wide, lanceolate or elliptic-rhomboid, pinnately veined, glabrous, margin toothed, teeth eglandular, base slightly hairy, petiole 3 mm., adaxially hairy; Flowers, in small groups of 2-3; Pedicels, 9-18 mm., glabrous to sparsely hairy; Hypanthium, 2 mm.; Sepals, 2.5-2.8 mm., reflexed, few cobwebby hairs adaxially; Petals, free, white, 5-7 mm. × 2.5-4.5 mm. wide; Stamens, many (30?); Ovary superior; Styles #1, 10 mm.; Fruit unknown (Described from Coll. No. 1093, 30 Apr 2015, and Coll. No. 1819, 16 May 2018).
- Heritage Dells, North Gulch, 4597. 4/23/2026. .
- Heritage Dells, South Gulch, 4490. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2741.
6/10/2022.
.
.
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.
- Heritage Dells, North Gulch, 4596. 4/23/2026. .
- Heritage Dells, South Gulch, 6155. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2740.
6/10/2022.
.
.
Rosa . Horticultural Rose. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, horticultural rose, not R. glauca. 6156. 6/1/2026. . .
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).
- Heritage Dells, North Gulch, 4650. 4/23/2026. .
- Heritage Dells, South Gulch, prickles on new growth, 11 leaflets. 6117. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3584.
6/8/2024.
.
.
 Coll. No. 3410, Rosa arkansana. |
 Coll. No. 3410, Rosa arkansana. |
 Coll. No. 1456, Rosa arkansana |
 Coll. No. 1670, Rosa arkansana |
 New growth of Coll. No. 1670, Rosa arkansana |
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).
- Heritage Dells, North Gulch, 4648. 4/23/2026. .
- Heritage Dells, South Gulch, 4510. 4/9/2026. 6148. 6/1/2026. 6154. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3586.
6/8/2024.
.
Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1091, Rubus deliciosus |
 Coll. No. 1091, Rubus deliciosus |
Salicaceae
Populus deltoides Marshall ssp. monilifera (Aiton) Eckenw. (Syn: Populus sargentii Dode ) Plains Cottonwood. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4602.
4/23/2026.
.
.
Salix irrorata Andersson. Dewystem Willow. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells & Tripp Ranch Meadow Open Spaces,
Damp soil, with Cirsium arvense, Turritis glabra, Melilotus officinalis, Carex bebbii, C. occidentalis, and Juncus interior.
In the southernmost gulch of Heritage Dells, middle section between DeFrance Way and Crawford Street, 135 m. downstream of DeFrance Way, 4.2 km. south of the GNIS location of Golden.
Tom Schweich 3550.
9 Apr 2026.
(
COLO
KHD
REGIS
UCR
)
.
 Coll. No. 3549, Salix irrorata. |
 Coll. No. 2490, Salix irrorata. |
 Coll. No. 3456, Salix irrorata. |
 Coll. No. 3550, Salix irrorata |
Santalaceae
Comandra umbellata (L.) Nutt. ssp. pallida (A. DC.) Piehl. (Syn: Comandra umbellata (L.) Nutt. var. pallida (A. DC.) M. E. Jones ) Pale Bastard Toadflax. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4623. 4/23/2026. 4641. 4/23/2026. .
- Heritage Dells, South Gulch, 4494. 4/9/2026. .
- Tripp Ranch Meadow Open Space,
2761.
6/10/2022.
.
Sapindaceae
Acer glabrum Torr. var. glabrum. (Syn: A. glabrum Torr. var. torreyi (Greene) Smiley ) Rocky Mountain Maple. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
4508.
4/9/2026.
Tom Schweich 3591.
1 Jun 2026.
(
Undist.
)
.
.
Acer negundo L. (Syn: Acer negundo L. var. interius (Britton) Sarg. , Negundo aceroides (L.) Moench ) Box Elder. CalPhotos. Jepson eFlora. SEINet Taxon.
Tree, ±5 m.; Branches, young, soft short hairy (var. interius); Leaves, opposite, ternately compound, leaflets 3; Pistil 1; Stigma, branches 2; Fruit, 2 winged 1-seeded samaras. (Described from Coll. No. 1102, 11 May 2015).
- Heritage Dells, North Gulch,
4606.
4/23/2026.
.
 Coll. No. 2457, Acer negundo. |
 Emerging staminate flowers of Acer negundo. |
 Britton & Shafer (1908) Figure 608, Acer interior. |
 Coll. No. 1102, 11 May 2015 |
 Coll. No. 2451, Acer negundo |
Scrophulariaceae
Scrophularia lanceolata Pursh. Lanceleaf Figwort. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
Tom Schweich 3587.
6/8/2024.
.
.
 Scrophularia lanceolata at Devils Churn Trail. |
Verbascum thapsus L. Common Mullein. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4624. 4/23/2026. 4626. 4/23/2026. .
- Tripp Ranch Meadow Open Space,
Tom Schweich 3580.
6/8/2024.
.
 Package of Mullein in the Pharmacy at Fort Hartsuff. |
 Dense colonies of Common Mullein (Verbascum thapsus) in Cottonwood Canyon |
 Collection No. 512, Verbascum thapsus |
Amaryllidaceae
Allium × proliferum (Moench) Schrad. ex Willd. Garden Onion. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, Middle Gulch,
4517.
4/9/2026.
.
.
 Horticultural Allium escaped to Kinney Run. |
 Head of Coll. No. 2415, Allium × proliferum |
Allium textile A. Nelson & J.F. Macbr. Textile Onion. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
Tom Schweich 3588.
6/8/2024.
.
 Coll. No. 2302, Allium textile |
 Habitat of Coll. No. 1134, Alliaceae Allium textile |
 Coll. No. 2933, Allium textile |
 Bulb coat of Coll. No. 1134, Allium textile |
 Coll. No. 1134, Allium textile |
Asparagaceae
Muscari botryoides (L.) Mill. Common Grape Hyacinth. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4638.
4/23/2026.
.
.
 Coll. No. 1310, Muscari botryoides |
 Coll. No. 1786, Muscari botryoides |
Yucca glauca Nutt. Soapweed Yucca. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch,
4619.
4/23/2026.
.
 Yucca glauca “Soapweed Yucca” on Dakota Ridge. |
Cyperaceae
Carex bebbii Olney. Bebb's Sedge. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells & Tripp Ranch Meadow Open Spaces,
Wet bottom of gulch with Carex occidentalis, Juncus interior, and Salix irrorata.
The three gulches of Heritage Dells were designated a City of Golden Open Space in July, 2025.
Heritage Dells, south gulch, middle section between DeFrance Way and Crawford Street, 135 m. downstream of DeFrance Way, 4.2 km. south of the GNIS location of Golden.
Tom Schweich 3588.
1 Jun 2026.
(
FLD
KHD
OBI
)
.
.
 Coll. No. 3588, Carex bebbii. |
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.
- Heritage Dells, North Gulch, 4633. 4/23/2026. .
- Heritage Dells, South Gulch,
4493.
4/9/2026.
4504.
4/9/2026.
.
.
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 & 3567.)
- Heritage Dells & Tripp Ranch Meadow Open Spaces,
Wet bottom of gulch with Carex bebbii, Juncus interior, and Salix irrorata.
Heritage Dells, south gulch, middle section between DeFrance Way and Crawford Street, 135 m. downstream of DeFrance Way, 4.2 km. south of the GNIS location of Golden.
Tom Schweich 3587.
1 Jun 2026.
.
Iridaceae
Iris L. Horticultural Iris. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, North Gulch, 4637. 4/23/2026. .
- Heritage Dells, South Gulch, 6128. 6/1/2026. .
Juncaceae
Juncus interior Wiegand. Inland Rush. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial graminoid, to 45 cm., Culm, 40 cm, round, 1 mm. dia.; Leaves, basal, outer, 7 mm., sheath-like, inner, sheath, 80 mm., open, ligule, 0.5 mm., membraneous, blade, 225 mm., rolled; Bracts, #2, 85 mm., 46 mm.; Pedicel, 3 mm., bract, 2 mm.; Flowers, #17, closely subtended by a pair of scarious bracteoles; Tepals, 3.2 mm. lanceolate, tip acuminate, green center, then light brown strips, then scarious margin; Capsule, 3.5 mm., rounded at summit, placenta extends nearly to tip; Seeds, 0.5 mm., oblong, not tailed, annular grooves; (Described from Coll. No. 1527, 5 August 2014).
- Heritage Dells & Tripp Ranch Meadow Open Spaces,
Wet bottom of gulch with Carex occidentalis, Carex bebbii, and Salix irrorata.
The three gulches of Heritage Dells were designated a City of Golden Open Space in July, 2025.
Heritage Dells, south gulch, middle section between DeFrance Way and Crawford Street, 135 m. downstream of DeFrance Way, 4.2 km. south of the GNIS location of Golden.
Tom Schweich 3589.
1 Jun 2026.
(
FLD
)
.
Melanthiaceae
Toxicoscordion paniculatum (Nutt.) Rydb. (Syn: Zigadenus paniculatus (Nutt.) S. Watson , Zigadenus paniculatus (Nutt.) S. Watson ) Foothill Death Camas. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2786.
6/10/2022.
.
 Likely Toxicoscordion paniculatum whose leaf tips were scorched by the Hogback Fire (2023). |
 Inflorescence of Coll. No. 2055, Toxicoscordion paniculatum |
Poaceae
Aegilops cylindrica Host. (Syn: Cylindropyrum cylindricum (Host) Á.Löve ) Jointed Goat Grass. Weed: CO DofA, List: B. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch,
6141.
6/1/2026.
.
.
 Inflorescence of Coll. No. 1139, Aegilops cylindrica |
 Inflorescence of Coll. No. 1139, Aegilops cylindrica |
Agropyron cristatum (L.) Gaertn. Crested Wheat Grass. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6119. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2754.
6/10/2022.
.
.
Bouteloua dactyloides (Nutt.) J.T. Columbus. (Syn: Buchloe dactyloides (Nutt.) Engelm. ) Buffalo Grass. CalPhotos. Jepson eFlora. SEINet Taxon.
- Tripp Ranch Meadow Open Space,
2784.
6/10/2022.
.
.
Bromus inermis Leyss. (Syn: B. inermis Leyss. ssp. inermis ) Smooth Brome. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass to 1 m., rhizomatous; Leaves, sheath, 8-11 cm., closed, ligule, <1 mm., membraneous, blade, 12-17 cm × 0.5 cm., flat, soft, with a distinguishing fold, usually described as an “M” or a “W” that is difficult to see when dry; Inflorescence, panicle, 15 cm. × 4 cm. wide, multiple 1° branches per node, mostly on one side of rachis; Spikelets, 1 per node on 1° and 2° panicle branches, 15-24 mm. × 5 mm. wide, laterally compressed, 2-6 florets per spikelet; Glumes, 2, keeled, glabrous, lower, 7-8 mm., veins 1 upper, 8-10 mm., <lowest floret; Rachilla, sparsely hairy on abaxial side, extended beyond uppermost floret or not; Callus, small, glabrous; Lemma, 11-12 mm., veins, 3, 5, 7, obvious, tip bifid, some awned; Awn (when present), 1.0-1.6 mm., arising near tip of lemma; Palea, 9 mm., veins ciliate. (Described from Coll. No. 1113, 26 May 2014, and Coll. No. 1219, 16 Jul 2015).
- Heritage Dells, North Gulch, 4607. 4/23/2026. .
- Heritage Dells, South Gulch, 6115. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2742.
6/10/2022.
.
.
Bromus tectorum L. (Syn: B. tectorum L. var. glabratus Spenn. ) Cheat Grass. Weed: CO DofA, List: C. CalPhotos. Jepson eFlora. SEINet Taxon.
Annual grass, to 30 cm.; Leaves, Sheath, 50 mm., closed proximal ⅔, open distally, Ligule, membraneous, 1 mm.; Blade, 60 mm.; Inflorescence, open panicle, rachis and pedicels short hairy, Spikelets, 1 per node, 15 mm., laterally compressed; Glumes, 2, sparsely hairy, margins scarious, lower, 2.3 mm., veins indistinct, upper, 4.5 mm. Callus, glabrous, very short, Florets, ±6, Lemma, 6.5 mm., 0.7 from mid-vein to margin, back rounded, sparsely hairy, tip, forked, teeth 1 mm., awned from near tip, awn, 5-7 mm.; Anthers, 3, 0.4 mm. Described from Coll. No. 1112, 26 May 2015. Dimensions are small for B. tectorum, perhaps because of the early date of collection.
- Heritage Dells, North Gulch, 4652. 4/23/2026. .
- Heritage Dells, South Gulch,
6130.
6/1/2026.
.
.
 Coll. No. 1112, Bromus tectorum |
Dactylis glomerata L. Orchard Grass. CalPhotos. Jepson eFlora. SEINet Taxon.
Perennial grass, to 1.0-1.2 m.,
not rhizomatous,
basal or subterranean internodes not swollen;
Stem herbaceous;
Leaf,
Sheath open and closed observed, published descriptions are roughly equally divided as to whether the sheath is open or closed,
Ligule membraneous, 5 mm.;
Blade, differentiated from sheath, base not constricted, soft,
25 cm. × 0.7 cm. wide, not sharp-pointed;
Auricle, rounded, <1 mm., generally described as 0;
Infloresence exceeding leaves, 13 cm., panicle, well developed, erect, 1° branches open, branching 4° or 5°;
Spikelets not enclosed in a bur-like involucre,
not subtended by bristles or long silky hairs,
similar throughout plant,
all on one side of rachis,
crowded in dense clusters,
on 2°-4° panicle branches
1 per node,
axis few hairy,
some spikelets appear to be infertile;
Glumes, 2
< lowest floret,
lower, 3.5 mm, smaller and thinner than
upper, 6 mm.,
keeled,
glabrous to ciliate on keel, else sparsely hairy;
Florets
not modified into bulblets
4+ per spikelet ,
have feathery stigma-like material but no ovary (immature?),
uppermost vestigal floret not club-shaped rudiment (as seen in Melica);
Lemma
lowest largest, 5 mm., reduced above,
keeled, line of hairs on keel,
5 veins,
tip forked,
awn 1.0-1.5 mm.;
Palea
light green
with 2 veins
forked at tip.
Described from Collection No. 815, 9 May 2012, Alameda County, CA and
Coll. No. 1111, 26 May 2015, Jefferson County, CO.
- Tripp Ranch Meadow Open Space,
Tom Schweich 3589.
6/8/2024.
.
.
Festuca ovina L. Complex, hybrid or selection. CalPhotos. Jepson eFlora. SEINet Taxon.
- Heritage Dells, South Gulch, 6120. 6/1/2026. .
- Tripp Ranch Meadow Open Space, 2767. 6/10/2022. . .
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).
- Tripp Ranch Meadow Open Space,
2785.
6/10/2022.
.
.
 Coll. No. 992, Stipa comata var. comata |
 Coll. No. 1929, Hesperostipa comata |
 Florets of Coll. No. 1890, Hesperostipa comata |
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.
- Heritage Dells, South Gulch, 6138. 6/1/2026. .
- Tripp Ranch Meadow Open Space,
2750.
6/10/2022.
.
.
 Coll. No. 1131, Koeleria macrantha |
 Coll. No. 1117, Koeleria macrantha |
 Coll. No. 1131, Koeleria macrantha |
 Inflorescence of Coll. No. 1419, Koeleria macrantha |
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.
- Tripp Ranch Meadow Open Space, Tom Schweich 3591. 6/8/2024. .
| Total number of taxa: | 120 |
| Native Taxa: (serif, italic, bold) | 78 |
| Exotic Taxa: (sans-serif, italic) | 38 |
| Nativity Undetermined: (default font, italic) | 4 |
| Listed Weeds: Identified as Weed | 14 |
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.
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Date and time this article was prepared: 8/1/2026 3:21:49 PM.
