Astragalus didymocarpus var. didymocarpus |
Astragalus didymocarpus var. dispermus |
|
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common dwarf milkvetch, dwarf white milkvetch |
dwarf white milkvetch, notch leaf locoweed, wickenburg milkvetch |
|
Stems | usually erect or ascending, rarely diffuse, (2.5–)4–35(–45) cm. |
diffuse, weakly ascending, or prostrate, (1.5–)4–27 cm. |
Leaves | (0.8–) 1.5–7.5 cm; leaflets (9 or)11–17, blades 1.5–14 mm. |
1–3.5 cm; leaflets (7 or)9–15, blades 2–8 mm. |
Racemes | (5–)7–25-flowered; axis 0.2–1.5(–2.2) cm. |
7–20-flowered; axis 0.3–1.2 cm. |
Flowers | 2.8–5.3(–6.1) mm; calyx tube 1.5–2.8 mm, lobes subulate, 0.8–1.4(–2) mm, hairs mostly black, sometimes also white; corolla keel abruptly incurved, 2.4–4.3(–4.5) mm, apex bluntly deltate. |
(3.4–)4.3–5.4 mm; calyx tube 1.7–2.3 mm, lobes subulate or subulate-setaceous, (1.3–)1.6–2.4 mm, hairs mostly white, sometimes also black; corolla keel abruptly incurved, (3.4–)3.8–4.5 mm, apex usually bluntly deltate, sometimes obscurely beaklike. |
Legumes | (2–)2.3–3.4(–4) × 1.5–3 mm, strongly wrinkled transversely or diagonally, strigulose. |
2.3–4 × 1.6–2.5 mm, deeply sulcate, strongly wrinkled transversely or diagonally, strigulose-hirsutulous. |
2n | = 24. |
= 26. |
Astragalus didymocarpus var. didymocarpus |
Astragalus didymocarpus var. dispermus |
|
Phenology | Flowering Mar–May. | Flowering Feb–May. |
Habitat | Hillsides, plains, valley floors. | Foothills of desert mountains, on arid sandy soils, with Larrea. |
Elevation | 100–1600 m. (300–5200 ft.) | 30–1100(–1300) m. (100–3600(–4300) ft.) |
Distribution |
CA; NV; Mexico (Baja California) |
AZ; CA; NV; Mexico (Baja California) |
Discussion | Variety didymocarpus is the most widely dispersed form of the species, apparently having geographic contact with all of the other varieties and more or less blending with them. It occurs from the Sacramento Valley southward through the San Joaquin Valley, then nearer the coast (including the Channel Islands) to Baja California, with eastern populations in eastern Inyo County and adjacent Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety dispermus occurs from the western edge of the California deserts across southern Nevada to central and southern Arizona. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. catalinensis, A. didymocarpus var. daleoides | A. dispermus |
Name authority | unknown | (A. Gray) Jepson: Fl. Calif. 2: 376. (1936) |
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