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Photo is of parent taxon

ascending purple milk-vetch, prairie milkvetch, standing milk-vetch

Leaves

4–17 cm;

leaflets (9 or)11–25, blades (4–)8–27(–33) mm.

Racemes

(7–)16–50-flowered;

axis (0.6–)1.5–9(–13) cm in fruit.

Peduncles

(3–)4–14(–16.5) cm.

Flowers

13–19.5 × 4–7(–8) mm;

calyx 5.8–10.5 mm, tube (4–)4.4–7 × (2–)2.3–3.2 mm, lobes subulate or subulate-setaceous, 1.4–4.2 mm;

corolla magenta-purple, reddish lilac, dull blue, pale milky white.

Legumes

narrowly ovoid-, oblong-, or lanceoloid-ellipsoid, 7–12 × 2.3–3.8 mm, densely strigulose, hairs short and sinuous mixed with longer and straight ones, white or mixed with black;

stipes 0–0.5 mm.

Seeds

9–14(–16).

2n

= 32.

Astragalus laxmannii var. robustior

Phenology Flowering May–Aug.
Habitat Plains, prairies, dry hillsides, on bare, rocky or gravelly areas on gravelly or shingly lakeshores or riverbanks, on sedimentary bedrock.
Elevation 200–2000(–3400) m. (700–6600(–11200) ft.)
Distribution
from FNA
CO; IA; ID; MN; MT; ND; NE; NM; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
[BONAP county map]
Discussion

R. C. Barneby (1964) reviewed, partly in tabular form, the extensive synonymy associated with the widespread var. robustior. Some of the variants may ultimately be found to be worthy of taxonomic recognition.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Onobrychoidei > Astragalus laxmannii
Sibling taxa
A. laxmannii var. tananaicus
Synonyms A. adsurgens var. robustior, A. adsurgens subsp. robustior, A. striatus
Name authority (Hooker) Barneby & S. L. Welsh: Great Basin Naturalist 56: 85. (1996)
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