Astragalus bisulcatus var. haydenianus
Astragalus sect. Bisulcati
Hayden's milkvetch
several to many.
odd-pinnate, short-petiolate or subsessile;
leaflets (7–)11–35.
(13–)21–35, 5–27 mm.
35–80-flowered;
axis (4–)5.5–25 cm in fruit;
bracts (2.5–)3–5 mm.
initially densely flowered, flowers declined or nodding, often retrorsely imbricate.
8–11 mm;
calyx usually pallid, tube 3.1–4 mm, lobes 1–2.7 mm;
corolla white or whitish to ochroleucous;
banner longer than keel.
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.
ellipsoid or oblong-ellipsoid, (5–)6.5–9.5 × 2–4 mm, transversely rugose-reticulate, strigulose;
stipe 1.4–3 mm.
ultimately deciduous, stipitate, pendulous, linear-ellipsoid to oblong-ovoid, compressed dorsiventrally with 2 adaxial grooves or 3-sided, unilocular.
5–8.
5–22.
usually basifixed, rarely incipiently malpighian.
connate or distinct at distal nodes.
= 24.
Astragalus bisulcatus var. haydenianus
Astragalus sect. Bisulcati
Variety haydenianus from the Wasatch Plateau in Utah has been confused by some workers with the similarly pale-flowered var. major, but the flowers are consistently smaller, much more numerous, and the fruits smaller than in var. major.
(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.)
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
