Astragalus miser var. serotinus |
Astragalus miser var. decumbens |
|
---|---|---|
Cooper's weedy milkvetch, timber milk-vetch, weedy milk-vetch |
prostrate milkvetch, reclining weedy milkvetch |
|
Herbage | strigulose, hairs basifixed. |
strigulose, hairs obscurely malpighian, silvery-silky, ± straight. |
Stems | 10–35 cm. |
1–15(–22) cm. |
Leaves | 4–15(–17.5) cm; leaflets (9 or)11–19(or 21), blades narrowly elliptic to linear or linear-oblanceolate, (2–)4–30(–40) mm, apex acute or obtuse, surfaces pubescent abaxially, glabrous adaxially. |
1.5–9(–12) cm; leaflets (7 or)9–15(or 17), blades narrowly elliptic to oval-lanceolate, leaflets subtending racemes more broadly elliptic or oblanceolate, (2–)4–16(–20) mm, apex acute to obtuse, surfaces pubescent; terminal leaflet decurrent or jointed. |
Racemes | loosely (3–)6–16(–24)-flowered; axis (1.5–)2.5–14 cm in fruit. |
(4–)7–17-flowered; axis 1–3(–4) cm in fruit. |
Flowers | calyx 3–4.2 mm, tube 2.3–3.1 mm, lobes 0.7–1.3 mm; corolla whitish or suffused or veined purple, keel pinkish lilac; banner 7–9.5 mm; keel 6–7.8(–8.4) mm. |
calyx 2.8–4.3 mm, tube 1.8–2.5 mm, lobes 0.9–1.9 mm; corolla usually pink-purple, purplish, bluish, or dull purple, sometimes pallid or whitish, except maculate keel; banner 6.9–9.6 mm; keel 6.2–7.8 mm. |
Legumes | linear-oblong, 13–18(–21) × 2–2.8(–3.2) mm, glabrous or strigulose. |
linear-oblong or -oblanceoloid, (12–)14–21 × 2.2–3.3 mm. |
Seeds | 7–10. |
12–18. |
2n | = 22. |
|
Astragalus miser var. serotinus |
Astragalus miser var. decumbens |
|
Phenology | Flowering May–Aug. | Flowering May–Aug. |
Habitat | Banks, flats, rocky or grassy slopes, glades in pine forests. | Banks, hillsides, bluffs, ridge crests, with sagebrush, with limber pine and juniper. |
Elevation | 200–2000 m. (700–6600 ft.) | 1100–2600 m. (3600–8500 ft.) |
Distribution |
ID; MT; WA; AB; BC |
ID; MT; WY |
Discussion | Variety serotinus is known from the Columbia Basin in Washington, northward into British Columbia and Rocky Mountains of Alberta, and southward into northwestern Montana. D. Isely (1998) noted that var. serotinus is contiguous, and blends, with the purple-petaled var. miser. If origin is unknown, var. serotinus is often distinguished from var. hylophilus with difficulty. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety decumbens occurs from southern Montana on the Yellowstone River, southward (mostly eastward of the Continental Divide except on upper Green River) to central Wyoming. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. serotinus | Homalobus decumbens |
Name authority | (A. Gray) Barneby: Amer. Midl. Naturalist 55: 481. (1956) | (Nuttall) Cronquist: Leafl. W. Bot. 7: 18. (1953) |
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