Flora of North America species comparison

procumbent, trailing, or twining, villous or villosulous, hairs silvery, spreading.

prostrate or twining, tomentulose, hairs silvery or grayish.

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.

trifoliolate;

stipules persistent, subulate, 1–2 × 0.5–1 mm, apex acute to acuminate, surfaces tomentulose;

petiole 4–30 mm, tomentulose;

leaflet blades obovate or elliptic-lanceolate, 10–45 × 5–20 mm, leathery, gland-dotted, base obtuse, apex usually rounded or obtuse, rarely acuminate, surfaces strongly reticulate and densely grayish tomentulose abaxially, densely grayish tomentulose adaxially.

racemes, shorter than leaves, 1.5–5 cm.

racemes, shorter than or equal to leaves, 2–6 cm.

2–5 mm.

2–4 mm, viscid.

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.

calyx 5–7 mm, tomentose, viscid, tube 2–2.5 mm, lobes lanceolate, laterals 4–5 mm, lengths to 2.5 times tube, adaxials 2.5–5 mm;

corolla pale yellow;

banner suborbiculate, 8–10 × 6–7 mm, emarginate, puberulent, gland-dotted;

wings oblong, 8–9 × 2.5–3 mm, glabrous;

keel 8–9.5 × 2–2.5 mm, glabrous;

stamens 8–10 mm.

oblong-ovoid, compressed, 10–15 × 5–8 mm, villosulous.

ellipsoid, compressed, 15–17 × 4–6 mm, yellow-hirsute and puberulent, hairs intermixed.

brown, black, or mottled, subglobose, compressed, 3–4 × 3–3.5 mm.

brown, black, or mottled, ovoid-ellipsoid, compressed, 2.5–4 × 2.5–3 mm;

hilum linear, 1–1.5 mm.

, herbaceous.

= 22.