Astragalus kentrophyta var. douglasii |
Astragalus kentrophyta var. coloradoensis |
|
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Douglas kentrophyta, Douglas' spiny milkvetch, spiny millk-vetch, thistle milk-vetch |
Canyonlands kentrophyta, Colorado spiny milkvetch |
|
Habit | Plants prostrate, densely mat-forming, becoming suffruticose. | Plants loosely mat- or clump-forming, low, to 12 cm. |
Stems | and herbage strigulose, hairs basifixed. |
and herbage strigulose, hairs malpighian. |
Leaves | 1–1.7 cm; stipules dimorphic, 2–5 mm; leaflets 5(or 7), blades 5–12 mm, surfaces pubescent. |
0.9–2.4 cm; stipules 1–12 mm; leaflets (3 or)5(or 7), blades 4–15 mm, surfaces pubescent. |
Peduncles | subobsolete. |
0.2–0.6 cm. |
Flowers | 5.8 mm; calyx 4.7–5.2 mm, tube 2.2–2.4 mm, lobes subulate, spinulose, 2.3–3 mm; corolla whitish. |
7.3–10 mm; calyx 6–8.3 mm, tube 2.4–3.3 mm, lobes subulate, spinulose, 3.4–5 mm; corolla pink-purple. |
Legumes | lanceoloid, 5–5.5 × 2 mm. |
subsymmetrically ellipsoid, lanceoloid- or oblong-ellipsoid, (5–)7–10 × 2.8–4 mm. |
Seeds | 2. |
4–8. |
2n | = 24. |
= 24. |
Astragalus kentrophyta var. douglasii |
Astragalus kentrophyta var. coloradoensis |
|
Phenology | Flowering Jun. | Flowering Apr–Jun. |
Habitat | Sandy substrates. | Sandy wash bottoms, sandy pockets on sandstone rimrock, in mixed desert shrub communities. |
Elevation | 150–400 m. (500–1300 ft.) | 900–1700 m. (3000–5600 ft.) |
Distribution |
OR; WA |
AZ; UT |
Discussion | Variety douglasii is known from only a few, vague historical records, probably taken near the present city of Walla Walla near the Great Bend of the Columbia River, and appears to be extinct. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety coloradoensis is known from north-central Arizona and south-central Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Barneby: Mem. New York Bot. Gard. 13: 364. (1964) | M. E. Jones: Contr. W. Bot. 10: 63. (1902) |
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