Flora of North America species comparison

prostrate (twining distally), hirtellous, hairs grayish.

usually unifoliolate, distalmost rarely trifoliolate;

stipules persistent, ovate-lanceolate, 3–5 × 1.5–2 mm, apex acuminate;

petiole 20–40 mm, densely hirsute;

leaflet blades reniform or orbiculate, 20–50 × 20–70 mm, leathery, gland-dotted, base truncate or subcordate, apex obtuse, obscurely mucronulate, surfaces reticulate and tomentose-woolly abaxially, rugose and finely strigose adaxially.

in clusters on peduncles, shorter than leaves, 2–6 cm.

3–8 mm.

calyx 14–16 mm, hirsute, tube 2 mm, lobes lanceolate or elliptic, laterals 12–14 mm, adaxials 5 mm;

corolla yellow-orange;

banner obovate, 10–12 × 5–6 mm, emarginate, puberulent, with a pair of internal callosities;

wings oblong, 9–11 × 2–2.5 mm, glabrous;

keel 9–10 × 2–2.5 mm, glabrous;

stamens 9–10 mm.

ovoid-oblong, compressed, 10–18 × 5–9 mm, gland-dotted, tomentose.

brown, black, or mottled, subglobose, compressed, 3.5–4 × 3.5–4 mm.

, herbaceous.