Astragalus laxmannii var. robustior |
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ascending purple milk-vetch, prairie milkvetch, standing milk-vetch |
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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 |
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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 |
CO; IA; ID; MN; MT; ND; NE; NM; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT |
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 | |
Sibling taxa | |
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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