Vines, herbaceous. Stems pro­cumbent, trailing, or twining, villous or villosulous, hairs silvery, spreading. Leaves usually unifoliolate, distalmost rarely trifoliolate; stipules persistent, ovate-lanceolate, 2–5 × 1–2.5 mm, apex acuminate; petiole 10–45 mm, villosulous; leaflet blades suborbiculate to reniform, 15–40 × 20–55 mm, leathery, gland-dotted, base cordate, apex broadly rounded, surfaces villosulous abaxially, rugose and finely strigose adaxially. Inflores­cences racemes, shorter than leaves, 1.5–5 cm. Pedicels 2–5 mm. Flowers: calyx 7–13 mm, villosulous, tube 1.5–2 mm, lobes lanceolate, laterals 6–10 mm, adaxials 2–4 mm; corolla yellow, often tinged brown; banner obovate, 8.5–10 × 6.5–7.5 mm, emarginate, puberulous; wings narrowly oblong, 6.5–7.7 × 2–2.5 mm, glabrous; keel 8–9 × 3–3.5 mm, glabrous; stamens 7.5–8.5 mm. Legumes oblong-ovoid, compressed, 10–15 × 5–8 mm, villosulous. Seeds brown, black, or mottled, subglobose, compressed, 3–4 × 3–3.5 mm. 2n = 22.

Phenology: Flowering spring–summer.
Habitat: Sandy soils, prairies, fields, oak woodlands, roadsides, sand dunes.
Elevation: 0–300 m.

Distribution

• Generated Map
• Legacy Map

Tex., Mexico (Chiapas, Durango, San Luis Potosí, Sinaloa, Tamaulipas, Veracruz).

Discussion

In Texas, Rhynchosia americana occurs in coastal and southern counties.

Selected References

None.

Lower Taxa

None.