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Photo is of parent taxon

common dwarf milkvetch, dwarf white milkvetch

Photo is of parent taxon

San Luis obispo milkvetch

Stems

usually erect or ascending, rarely diffuse, (2.5–)4–35(–45) cm.

mostly erect or ascending, (2.5–)3–25 cm.

Leaves

(0.8–) 1.5–7.5 cm;

leaflets (9 or)11–17, blades 1.5–14 mm.

1–5 cm;

leaflets 9–17, blades 1.5–10 mm.

Racemes

(5–)7–25-flowered;

axis 0.2–1.5(–2.2) cm.

(5–)8–30-flowered;

axis 0.2–2 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.

(6.2–)7–8.6 mm;

calyx tube 2.1–2.8 mm, lobes subulate-setaceous, (0.9–)1.1–2.5 mm, hairs white, sometimes also black;

corolla keel incurved, (5.2–)5.5–7.2 mm, apex narrowly triangular, acute or subacute, slightly beaklike.

Legumes

(2–)2.3–3.4(–4) × 1.5–3 mm, strongly wrinkled transversely or diagonally, strigulose.

(2–)2.3–3.4(–4) × 1.5–3 mm, strigulose.

2n

= 24.

Astragalus didymocarpus var. didymocarpus

Astragalus didymocarpus var. obispensis

Phenology Flowering Mar–May. Flowering Mar–May.
Habitat Hillsides, plains, valley floors. Grassy sites, chaparral.
Elevation 100–1600 m. (300–5200 ft.) 400–1100 m. (1300–3600 ft.)
Distribution
from FNA
CA; NV; Mexico (Baja California)
[BONAP county map]
from FNA
CA; 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 obispensis occurs mostly inland but west of the deserts, from Los Angeles County southward to Baja California.

(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. dispermus, A. didymocarpus var. milesianus
Synonyms A. catalinensis, A. didymocarpus var. daleoides Hesperastragalus obispensis
Name authority unknown (Rydberg) Jepson: Fl. Calif. 2: 376. (1936) — (as obispoensis)
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