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Photo is of parent taxon

common dwarf milkvetch, dwarf white milkvetch

Photo is of parent taxon

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
from FNA
CA; NV; Mexico (Baja California)
[BONAP county map]
from FNA
AZ; CA; NV; Mexico (Baja California)
[BONAP county map]
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 Fabaceae > subfam. Faboideae > Astragalus > Astragalus didymocarpus Fabaceae > subfam. Faboideae > Astragalus > Astragalus didymocarpus
Sibling taxa
A. didymocarpus var. dispermus, A. didymocarpus var. milesianus, A. didymocarpus var. obispensis
A. didymocarpus var. didymocarpus, A. didymocarpus var. milesianus, A. didymocarpus var. obispensis
Synonyms A. catalinensis, A. didymocarpus var. daleoides A. dispermus
Name authority unknown (A. Gray) Jepson: Fl. Calif. 2: 376. (1936)
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