Astragalus laxmannii var. tananaicus |
Astragalus laxmannii var. robustior |
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Laxmann's milk-vetch, standing milkvetch, tanana milkvetch |
ascending purple milk-vetch, prairie milkvetch, standing milk-vetch |
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Leaves | (2–)4–10 cm; leaflets (7–)11–17, blades (4–)7–25 mm. |
4–17 cm; leaflets (9 or)11–25, blades (4–)8–27(–33) mm. |
Racemes | 10–20-flowered; axis 1–3.5 cm in fruit. |
(7–)16–50-flowered; axis (0.6–)1.5–9(–13) cm in fruit. |
Peduncles | 4–12 cm. |
(3–)4–14(–16.5) cm. |
Flowers | 11.5–16.2 × 4.5–6.6 mm; calyx 5.6–6.8 mm, tube 4.6–5.7 × 3–3.8 mm, lobes subulate, 0.4–1(–2.1) mm; corolla white. |
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 oblong or oblong-ellipsoid, 6–12 × 2.5–4 mm, densely strigulose, hairs black and relatively short, with ascending, white, straight, longer ones; stipe 0.7–1.8 mm. |
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–)12–16(–18). |
9–14(–16). |
2n | = 32. |
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Astragalus laxmannii var. tananaicus |
Astragalus laxmannii var. robustior |
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Phenology | Flowering Jun–early Aug. | Flowering May–Aug. |
Habitat | Shaley river bluffs, shingle bars, pebbly banks of streams, on disturbed gravelly or sandy soils near highways, airfields, or beaches, dry grassy meadows, hillsides. | Plains, prairies, dry hillsides, on bare, rocky or gravelly areas on gravelly or shingly lakeshores or riverbanks, on sedimentary bedrock. |
Elevation | 100–800 m. (300–2600 ft.) | 200–2000(–3400) m. (700–6600(–11200) ft.) |
Distribution |
AK; YT |
CO; IA; ID; MN; MT; ND; NE; NM; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT |
Discussion | Variety tananaicus is known mostly from the Yukon River drainage in southern Yukon and east-central Alaska. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. tananaicus, A. adsurgens subsp. viciifolius | A. adsurgens var. robustior, A. adsurgens subsp. robustior, A. striatus |
Name authority | (Hultén) Barneby & S. L. Welsh: Great Basin Naturalist 56: 85. (1996) | (Hooker) Barneby & S. L. Welsh: Great Basin Naturalist 56: 85. (1996) |
Web links |