Astragalus lentiginosus var. coulteri
Contr. W. Bot. 8: 4. 1898.
Plants winter-annual, 10–30 cm, herbage densely pubescent). Leaves 6–10(–16) cm; leaflets (7–)15–19, blades broadly obovate-cuneate to elliptic-oblanceolate, 4–14(–21) mm, apex obtuse or emarginate to retuse. Peduncles 5–10 cm. Racemes loosely 13–35(–48)-flowered; axis (4.5–)6–18(–26) cm in fruit. Flowers 12–14.8 mm; calyx 5.2–6.6 mm, tube 4–5.1 mm, lobes 1–2.3 mm; corolla pink-purple. Legumes greenish stramineous, sometimes faintly mottled, lanceoloid to ovoid-acuminate, not or scarcely inflated, slightly turgid, 15–23 × 4.5–6 mm, ± bilocular, thin becoming papery, silky-strigulose-villosulous; beak short, unilocular. Seeds (10–)13–20.
Phenology: Flowering late Feb–May.
Habitat: Sandy flats and semistabilized dunes, with Larrea.
Elevation: 30–900 m.
Distribution
Ariz., Calif., Mexico (Sonora).
Discussion
Variety coulteri is found in the southern Colorado Desert, extending from eastern San Diego County in California, to the Yuma Desert in extreme southwestern Yuma County in Arizona, and adjacent Sonora, Mexico.
Selected References
None.