Astragalus kentrophyta var. danaus |
Astragalus kentrophyta var. jessiae |
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Mount Dana kentrophyta, spiny milkvetch, Sweetwater Mountains. milk vetch |
jessie's kentrophyta, spiny milkvetch |
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Habit | Plants prostrate, mat- or cushion-forming, to 15 cm wide. | Plants spreading or prostrate, loosely mat-forming, 5–35 cm wide. |
Stems | and herbage strigulose, hairs basifixed. |
and herbage strigulose, hairs malpighian. |
Leaves | 0.4–1.5(–2) cm; stipules somewhat dimorphic, 2–7 mm; leaflets 3(–7), blades 3–7 mm. |
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 | 0.2–0.6 cm. |
0.1–0.6 cm. |
Flowers | 4–5.6 mm; calyx 2.4–3.2 mm, tube 1.6–1.9 mm, lobes subulate to setaceous, 0.8–1.3 mm; corolla purple or whitish and keel purple. |
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 lenticular, 3.5–5 × 2–2.5 mm. |
lenticular or ovoid-lenticular, 3–4.5 × 1.4–2 mm. |
Seeds | 5–8. |
2(or 3). |
2n | = 24. |
= 24. |
Astragalus kentrophyta var. danaus |
Astragalus kentrophyta var. jessiae |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Aug. |
Habitat | Gravelly slopes and talus upward from timberline, or in bristle-cone pine forest. | Bluffs, ridges, dunes, sandy sites. |
Elevation | 3000–4000 m. (9800–13100 ft.) | 700–2400 m. (2300–7900 ft.) |
Distribution |
CA |
ID; OR; UT; WY |
Discussion | Variety danaus is restricted to high elevations in the southern Sierra Nevada. (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. tegetarius var. danaus | A. jessiae |
Name authority | (Barneby) Barneby: Leafl. W. Bot. 6: 154. (1951) | (M. Peck) Barneby: Leafl. W. Bot. 6: 154. (1951) |
Web links |