Flora of North America species comparison

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Astragalus racemosus var. treleasei
Photo is of parent taxon

Trelease's alkali milkvetch, Trelease's milkvetch
Leaflets

(9 or)11–19, blades 1.5–9(–12) mm wide.
Flowers

12–16 mm;

corolla ochroleucous, keel tip maculate or immaculate.
Legumes

plump, oblong-ellipsoid or -ovoid, 10–20 × (4–)5–8 mm.

Astragalus racemosus var. treleasei
Phenology Flowering May–Jul.
Habitat Sparsely vegetated, seleniferous saline clay and silty soils.
Elevation 1500–2300(–2500) m. (4900–7500(–8200) ft.)
Distribution
from FNA
CO; UT; WY
[BONAP county map]
Discussion

The disjunct western var. treleasei has two geographical races in Utah. Plants with the keel immaculate occur exclusively in the southern portion of the Uinta Basin. Elsewhere, keels are maculate.

Variety treleasei is primarily associated with the Tertiary Uinta and Duchesne River formations in Utah and on equivalent formations in Wyoming. It occurs in Moffat County in Colorado, Duchesne and Uintah counties in Utah, and Lincoln, Sublette, and Uinta counties in Wyoming.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Bisulcati > Astragalus racemosus
Sibling taxa
A. racemosus var. racemosus
Name authority Ced. Porter: Madroño 8: 99, plate 9, figs. 1–3. (1945)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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