Herbs to 0.6(–0.8) m. Stems glabrous or hairs whitish, to 0.7 mm. Leaves (2–)2.5–8(–9) cm; stipules usually persistent; petiole (1.5–)2–5(–6) mm, usually glabrous; leaflets (7–)10–22(–25) pairs, blades (3–)4–14 × 1–3 mm, margins ciliolate, some hairs 0.4+ mm. Pedicels 0.5–4 mm. Flowers: corolla often fading pinkish, petals to 3.5–7(–7.5) mm; stamens (4 or)5–8, staminodia 0; anthers to 2–3 mm; ovary hairy throughout; ovules 8–19. Legumes (17–)20–48(–56) × 2.5–3.8(–4) mm. Seeds 2.5–3.2 mm.

Phenology: Flowering mid summer–mid fall.
Habitat: Arid grasslands, desert slopes and washes, thorn-forests, open spaces in pine and oak forests.
Elevation: 10–2000 m.

Distribution

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Ariz., N.Mex., Tex., Mexico (Baja California, Chihuahua, Durango, Guerrero, Jalisco, Nayarit, Oaxaca, Sinaloa, Sonora).

Discussion

Variety leptadenia is known from Cochise, Gila, Graham, Greenlee, Pima, Pinal, and Santa Cruz counties in Arizona, Doña Ana, Grant, Hidalgo, and Luna counties in New Mexico, and Brewster, Jeff Davis, and Presidio counties in Texas.

Selected References

None.

Lower Taxa

None.