Flora of North America species comparison

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

usually ascending or erect, rarely twining, glabrous or sparsely to densely hirtellous, hairs 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.

usually unifoliolate, distalmost rarely trifoliolate;

stipules persistent, lanceolate to ovate-lanceolate, 4–15 × 1–4.5 mm, apex acute to acuminate;

petiole 15–45 mm, hirtellous;

leaflet blades suborbiculate to reniform or ovate to oblong, 20–50 × 25–70 mm, leathery, gland-dotted, base truncate, broadly rounded to cuneate, or subcordate, apex obtuse, broadly rounded, emarginate to mucronate, surfaces reticulate and hirtellous abaxially, rugose and strigulose, glabrescent adaxially.

racemes, shorter than leaves, 1.5–5 cm.

crowded in densely packed heads, flowers numerous, shorter than leaves, 1–3.5 cm.

2–5 mm.

1–3 mm.

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 7–10 mm, densely hirtellous, gland-dotted, tube 1.5–2 mm, lobes linear-lanceolate, laterals 7–8 mm, adaxials 2 mm;

corolla yellow;

banner elliptic-ovate, 6.5–7 × 6–6.5 mm, emarginate, glabrous;

wings narrowly oblong, 6.5–7 × 1.5–2.5 mm, glabrous;

keel 6.7–7 × 2–2.5 mm, glabrous;

stamens 6–7 mm.

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

oblong-ellipsoid, compressed, 13–18 × 5–7 mm, gland-dotted, hirtellous.

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

brown, black, or mottled, subglobose, compressed, 3 × 3 mm.

, herbaceous.

, herbaceous.

= 22.