Astragalus didymocarpus var. milesianus (Rydb.) Jeps.

Hesperastragalus milesianus Rydb. Bull. Torrey Club 53: 169. 1926.
An annual; stem erect, 2-3 dm. high, glabrous or with a few scattered hairs; leaves 4-6 cm. long, ascending; stipules 2-3 mm. long, deltoid, more or less scarious; leaflets 11-13, oblong-cuneate, about 1 cm. long and 2 mm. wide, emarginate, glabrous above, sparingly hairy beneath; peduncles 4-5 cm. long; racemes head-like, dense, 1-2 cm. long, fully 1 cm. broad; bracts lanceolate, 1-2 mm. long; flowers subsessile; calyx black-hairy, the tube 2-2.5 mm. long, the teeth subulate, fully 1 mm. long; corolla purplish; banner oblanceolate, 1 cm. long, emarginate; wings about S mm. long, the blade oblanceolate, with a large reflexed auricle; keel-petals about as long, the blade strongly arcuate near the rounded apex, with a small auricle; pod rounded-ovoid, strongly cross-ribbed, glabrous, 4 mm. long, nearly as thick and wide, broadly obcordate in cross-section.
Type locality: San Luis Obispo, California. Distribution: Known only from the type locality.