Herbs, perennial. Stems decum­bent or decumbent-assurgent, branched, 30–120 cm, densely uncinate-pubescent. Leaves tri­-foliolate; stipules caducous, narrowly ovate, 5+ mm; petiole 20–30 mm; leaflet blades ovate-elliptic to narrowly so, apex acute to obtuse, surfaces densely appressed-pubescent abaxially, sparsely so adaxially; terminal blade (20–)35–60 × 8–10(–15) mm, length 2.5–4 times width. Inflorescences axillary and terminal, branched or unbranched; rachis patent uncinate-puberulent to pubescent; primary bracts closely imbricate before anthesis, caducous, ovate, 5 mm. Pedicels 5–10 mm. Flowers: calyx 3–4 mm, sparsely pubescent, tube 1 mm; abaxial lobes 3 mm, lateral lobes 2 mm; corolla pink or purple to blue, 7–9 mm. Loments: sutures undulate abaxially, sinuate adaxially; connections adaxial, 1/4–1/3 as broad as segments; segments 4–7, semiorbiculate, 3–5 × 3–3.5 mm, rounded abaxially, slightly convex adaxially, glabrous or sparsely uncinate-puberulent throughout; stipe 1–2 mm.

Phenology: Flowering late summer–fall.
Habitat: Dry, rocky woodlands, pine or oak-juniper woodlands, canyons, roadsides.
Elevation: 1200–2100 m.

Distribution

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Ariz., N.Mex., Mexico (Baja California, Baja California Sur, Chihuahua, Guerrero, Sonora, Tamaulipas, Zacatecas).

Discussion

In the flora area, Desmodium batocaulon is known from southeastern Arizona and southwestern New Mexico.

Selected References

None.

Lower Taxa

None.