Eastern Mojave Vegetation Coll. No. 2154, Myosotis micrantha  


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  Boraginaceae Myosotis micrantha
Photographed 8 December 2019.

Plants of Jefferson County Open Space
Jefferson County, Colorado

Myosotis micrantha Pall. Ex Lehm.  Small-Flowered Forget-Me-Not.

Lippincott Property, Jefferson County, Colorado. Northernmost Jefferson County, parcel jointly owned by Jefferson County Open Space and City of Boulder OSMP, southwest corner near the railroad tracks, 22.3 km. north northwest of the GNIS location of Golden. 39.9024N, 105.2801W. WGS 1984 Elev. 2067 m. Deep forest duff in ponderosa pine woodland, with Collomia linearis, Eriogonum umbellatum, Hypericum perforatum, and Campanula rotundifolia.

Collected by permit: Jefferson County Open Space, 2019, issued: Mar 1, 2019, to: Tom Schweich.

Tom Schweich 2154. 13-Jul-2019

Coll. No. 2154, 13 Jul 2019, characters observed; Annual, 12-20 cm.; Stems, erect, branched at and above the base; Leaves, alternate, sessile, oblanceolate, 14 mm. × 5.5 mm. wide, strigose, few hooked hairs on abaxial mid-rib; Inflorescence, scorpioid, greatly exceeding leaves, although there are flowers throughout the plant; Pedicel, in fruit << calyx; Calyx, in flower, 2.5 mm., fused ±½, lobes ±equal, strigose, some hairs hooked, in fruit 4 mm.; Corolla, white, lobes, blue; Nutlets, 1.2 mm., >>style, brown, smooth, shiny, margin sharp raised.

I applied M. micrantha because the inflorescence greatly exceeds the leaves and the plant is floriferous nearly to the base. Also hairs are hooked on the abaxial mid-rib of the leaves, a character only described for M. micrantha (see the Jepson Manual of California, 2nd ed.). This will key to M. arvensis in Ackerfield (2015). However, M. micrantha is not a possibility there. Distribution of collections of the two taxa (SEINet, 8 Dec 2019) show collections of M. micrantha in northeast Utah and southeast Wyoming, whereas collections of M. arvensis are much farther from Colorado.

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Other photos about Species - Boraginaceae or Myosotis micrantha.


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Date and time this page was prepared: 4/14/2024 5:46:16 PM