Astragalus miser var. decumbens |
Astragalus miser var. hylophilus |
|
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prostrate milkvetch, reclining weedy milkvetch |
woodlands weedy milkvetch, woody milkvetch |
|
Herbage | strigulose, hairs obscurely malpighian, silvery-silky, ± straight. |
strigulose-pilosulous, hairs basifixed. |
Stems | 1–15(–22) cm. |
1–15 cm. |
Leaves | 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. |
(3–)4.5–19 cm; leaflets (9 or)11–21, blades narrowly to broadly elliptic, lanceolate, or lanceolate-oblong, (3–)5–26 mm, apex acute, obtuse, obtuse and apiculate, or, rarely, retuse, surfaces glabrous or sparsely pubescent. |
Racemes | (4–)7–17-flowered; axis 1–3(–4) cm in fruit. |
(3–)6–16-flowered; axis (1–)1.5–7(–7.5) cm in fruit. |
Flowers | 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. |
calyx (3.8–)4–5.6 mm, tube 2.6–3.5 mm, lobes (0.9–)1–2.3 mm; corolla whitish, sometimes purple-veined; banner (5.2–)6.5–13 mm; keel (7.1–)8–10(–11.4) mm. |
Legumes | linear-oblong or -oblanceoloid, (12–)14–21 × 2.2–3.3 mm. |
linear, linear-ellipsoid, or -oblanceoloid, (15–)18–25 × 2.5–4 mm, usually glabrous, rarely with few, scattered hairs. |
Seeds | 12–18. |
(6 or)7–11. |
Astragalus miser var. decumbens |
Astragalus miser var. hylophilus |
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Phenology | Flowering May–Aug. | Flowering Jun–Aug. |
Habitat | Banks, hillsides, bluffs, ridge crests, with sagebrush, with limber pine and juniper. | Meadows, banks, open parklands with lodgepole pine, Douglas-fir, and ponderosa pine. |
Elevation | 1100–2600 m. (3600–8500 ft.) | 900–2900 m. (3000–9500 ft.) |
Distribution |
ID; MT; WY |
ID; MT; SD; WY |
Discussion | 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.) |
Variety hylophilus occurs in the Rocky Mountains of western Wyoming and western Montana (and immediately adjoining Idaho), and the Black Hills of South Dakota. Variety hylophilus is sympatric, in part, with vars. crispatus, miser, and tenuifolius. Its distinction may be preserved by ecological isolation; of the four varieties it is the most mesic, whereas the others are more xerophytic (D. Isely 1998). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Homalobus decumbens | Homalobus hylophilus |
Name authority | (Nuttall) Cronquist: Leafl. W. Bot. 7: 18. (1953) | (Rydberg) Barneby: Amer. Midl. Naturalist 55: 482. (1956) |
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