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Photo is of parent taxon

cream milkvetch

Leaflets

(11–)17–31, blades 3–12 mm wide.

Flowers

16–19(–21) mm;

corolla whitish, concolorous, or keel tip lilac, wings and banner sometimes lightly suffused with purple or purple-veined.

Legumes

linear-oblong to narrowly oblong-ellipsoid, (15–)20–30 × 3–5.7 mm.

2n

= 24.

Astragalus racemosus var. racemosus

Phenology Flowering May–Jul.
Habitat Seleniferous bluffs, knolls, allu­vial bottoms and roadsides on clay, shale, or gypsum.
Elevation 500–1400 m. (1600–4600 ft.)
Distribution
from FNA
CO; KS; MN; MT; ND; NE; NM; OK; SD; TX; WY; SK; Mexico (San Luis Potosí)
[BONAP county map]
Discussion

T. Nuttall (1818) noted the disagreeable garlic odor associated with selenium in his description of Astragalus galegoides Nuttall (an illegitimate name pertaining to A. racemosus). The species often grows intermixed with A. bisulcatus; both are poisonous to livestock, producing so-called alkali disease or the blind-staggers. Variety racemosus does not occur west of the Continental Divide.

(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. treleasei
Synonyms A. racemosus var. longisetus
Name authority unknown
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