Astragalus racemosus var. treleasei
Astragalus sect. Bisulcati
Trelease's alkali milkvetch, Trelease's milkvetch
several to many.
odd-pinnate, short-petiolate or subsessile;
leaflets (7–)11–35.
(9 or)11–19, blades 1.5–9(–12) mm wide.
initially densely flowered, flowers declined or nodding, often retrorsely imbricate.
12–16 mm;
corolla ochroleucous, keel tip maculate or immaculate.
pink-purple, ochroleucous, or white, banner recurved through 45(–90)°, keel longer or shorter than banner, apex rounded.
tubes short cylindric or oblique-campanulate, gibbous at base.
plump, oblong-ellipsoid or -ovoid, 10–20 × (4–)5–8 mm.
ultimately deciduous, stipitate, pendulous, linear-ellipsoid to oblong-ovoid, compressed dorsiventrally with 2 adaxial grooves or 3-sided, unilocular.
5–22.
usually basifixed, rarely incipiently malpighian.
connate or distinct at distal nodes.
Astragalus racemosus var. treleasei
Astragalus sect. Bisulcati
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.)
Species 2 (2 in the flora).
Section Bisulcati is distributed from Alberta to Manitoba, in southern to western Oklahoma, western Texas, northern Arizona, and southwestern Utah, westward to east-central Nevada, southeastern Idaho, and western Montana, and disjunctly in central Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
