Flora of North America species comparison

usually prostrate or twining, rarely subascending, puberulent to strigulose or villosulous, hairs silvery.

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

trifoliolate;

stipules persistent, linear or linear-lanceolate, 1.5–3 × 0.5 mm, acute to acuminate;

petiole 5–35 mm, puberulous, strigulose, or villosulous;

leaflet blades lanceolate-ovate, 5–45 × 20–25 mm, leathery, gland-dotted, base obtuse or subcordate, margins revolute, apex acute or obtuse, surfaces puberulent, strigulose, or villosulous.

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.

1(2 or 3) simple flowers per axil, shorter than leaves, 0.6–1.5 cm.

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

1–6 mm.

1–3 mm.

calyx 3–5 mm, villous or villosulous, tube 1.5–2.5 mm, lobes subulate, laterals 1–3.5 mm, lengths to 2.5 times tube, adaxials 0.5–2 mm;

corolla yellow, veined brown;

banner widely ovate, 5–7 × 3.5–5 mm, apex emarginate, puberulent;

wings oblong to ovate, 5–6 × 1–2 mm, glabrous;

keel 5–6.5 × 2–2.5 mm, glabrous;

stamens 4–6 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, compressed, 15–25 × 4–6 mm, puberulent-hirtellous, hairs intermixed.

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

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

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

, herbaceous.

= 22.