Astragalus kentrophyta var. kentrophyta |
Astragalus kentrophyta var. jessiae |
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spiny milkvetch |
jessie's kentrophyta, spiny milkvetch |
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Habit | Plants decumbent, loosely mat-forming. | Plants spreading or prostrate, loosely mat-forming, 5–35 cm wide. |
Stems | and herbage strigulose, hairs basifixed or obscurely malpighian. |
and herbage strigulose, hairs malpighian. |
Leaves | (0.7–)1–2.5 cm; stipules dimorphic, those at proximal nodes connate into short, bidentate sheath, those at distal nodes longer, connate at base only, lanceolate or lanceolate-acuminate, often without spines, 2–7 mm; leaflets 5 or 7, blades 7–12 mm, surfaces pubescent abaxially, glabrous or glabrescent adaxially. |
1–1.7 cm; stipules dimorphic, those at proximal nodes connate into short, bidentate sheath, those at distal nodes longer, connate at base only, lanceolate or lanceolate-acuminate, often without spines, 1.5–7(–8) mm; leaflets 5, blades 4–10 mm, surfaces pubescent. |
Peduncles | subobsolete to 0.2 cm. |
0.1–0.6 cm. |
Flowers | 4–5.5 mm; calyx 3.4–4 mm, tube 1.9–2.4 mm, lobes subulate to setaceous, 1.4–2 mm; corolla whitish. |
5.2–6.5 mm; calyx 3.6–5.1 mm, tube 1.6–2.5 mm, lobes subulate, spinulose, 1.9–3 mm; corolla whitish, banner and keel tips sometimes faintly tinged pink or lilac. |
Legumes | subsymmetrically ovoid-lenticular, (3.5–)4–7 × 2.4–3.8 mm. |
lenticular or ovoid-lenticular, 3–4.5 × 1.4–2 mm. |
Seeds | 2 or 3(or 4). |
2(or 3). |
2n | = 24. |
= 24. |
Astragalus kentrophyta var. kentrophyta |
Astragalus kentrophyta var. jessiae |
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Phenology | Flowering Jun–Sep. | Flowering Jun–Aug. |
Habitat | Bluffs, dunes, gullied ridges in badlands. | Bluffs, ridges, dunes, sandy sites. |
Elevation | 1200–1600 m. (3900–5200 ft.) | 700–2400 m. (2300–7900 ft.) |
Distribution |
CO; MT; ND; NE; SD; WY; AB; SK |
ID; OR; UT; WY |
Discussion | Variety kentrophyta is a taxon of the High Plains from southeastern Alberta and southwestern Saskatchewan through eastern Montana, Wyoming and Colorado, the western Dakotas, and western Nebraska. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The distribution of var. jessiae is bicentric: southwestern Idaho and southeastern Oregon, and northeastern Utah and southwestern Wyoming. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. jessiae | |
Name authority | unknown | (M. Peck) Barneby: Leafl. W. Bot. 6: 154. (1951) |
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