Astragalus mollissimus var. coryi |
Astragalus mollissimus var. thompsoniae |
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Cory's woolly locoweed, woolly locoweed |
Thompson's woolly locoweed, woolly locoweed |
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Habit | Plants usually shortly caulescent, sometimes subacaulescent. | Plants acaulescent, 6–45 cm, from caudex. |
Stems | 2–25 cm, hairs spirally twisted, to 1.6–2.8 mm. |
mostly obscured by stipules. |
Leaves | (4–)6–20 cm; stipules (5–)7–15 mm; leaflets (11–)17–25(–29), blades usually obovate or oblong-oval, sometimes rhombic-obovate, 5–18 mm. |
2–28 cm; stipules 4–13 mm; leaflets 15–35, blades obovate to suborbiculate or elliptic, 2–18 mm. |
Racemes | densely 15–45-flowered; axis 3.5–9 cm in fruit. |
7–25-flowered; axis 1.5–18 cm in fruit. |
Peduncles | 8–21 cm. |
2.5–24 cm. |
Flowers | calyx 10.5–14 mm, tube 7–8.7 × 3–4 mm, lobes (3.3–)3.7–5.5 mm; corolla cream; banner (14.4–)15–20.3 mm; keel 12–17.4 mm. |
calyx 11–15.5 mm, tube 7.7–13 mm, lobes 2–4.2 mm; corolla pink-purple; banner 18–25 mm; keel 15–18.5(–20.5) mm. |
Legumes | narrowly ovoid or oblong-ellipsoid, 10–17 × 4.5–7 mm, glabrous or sparsely hispidulous (distally); beak unilocular. |
curved, ovoid, turgid, 11–23 × 6–11 mm, densely villous-tomentose; beak unilocular. |
Seeds | 28–38. |
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Astragalus mollissimus var. coryi |
Astragalus mollissimus var. thompsoniae |
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Phenology | Flowering Mar–May. | Flowering Mar–Jun (Oct). |
Habitat | Calcareous clay flats and depressions on rolling plains. | Salt desert shrub, mixed desert shrub, grasslands, and pinyon-juniper communities, usually on sandy substrates. |
Elevation | 500–1000 m. (1600–3300 ft.) | (700–)1100–2400 m. ((2300–)3600–7900 ft.) |
Distribution |
TX |
AZ; CO; ID; NM; NV; UT |
Discussion | Variety coryi is locally abundant on the northwestern Edwards Plateau in Crockett, Howard, Irion, Martin, Reagan, Schleicher, Sterling, and Upton counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety thompsoniae is transitional with var. matthewsii in northwestern New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. argillophilus | A. thompsoniae |
Name authority | Tidestrom: Proc. Biol. Soc. Wash. 50: 21. (1937) | (S. Watson) Barneby: Mem. New York Bot. Gard. 13: 747. (1964) — (as thompsonae) |
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