Flora of North America species comparison

usually prostrate or twining, rarely ascending, rarely viscid, glabrous, puberulent, or villosulous, hairs silvery or grayish, spreading or reflexed.

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

trifoliolate;

stipules persistent, linear to lanceolate, 1–6 × 1–2 mm, apex acuminate, surfaces puberulent to villosulous;

petiole 4–100 mm, glabrous, tomentulose, or villosulous;

leaflet blades rhombic-orbiculate, rhombic, subrhombic, or ovate, 30–90 × 5–70 mm, membranous or nearly leathery, gland-dotted, base obtuse to rounded, cuneate, or truncate, apex acuminate to obtuse, surfaces glabrous, puberulent, or sparsely to densely villosulous abaxially, glabrous or finely strigose, villosulous, or puberulent 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, longer than leaves, 2–20 cm.

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

1–5 mm.

1–3 mm.

calyx 3–6 mm, puberulent or villosulous, tube 1.5–2 mm, lobes lanceolate, laterals 1.5–4 mm, lengths to 2.5 times tube, adaxials 0.5–1 mm;

corolla yellow, veined purple or brown;

banner orbiculate-ovate, 4–6 × 3–5 mm, emarginate, puberulent, gland-dotted;

wings narrowly oblong, 4.5–5 × 1–2 mm, narrowly gland-dotted, puberulent apically;

keel 5–6 × 2–3 mm, glabrous;

stamens 5–7 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.

falcate to oblong-ovoid, compressed, 9–20 × 3–5 mm, glabrous, puberulent, or villosulous.

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

grayish, brown, black, or mottled, ovoid-reniform, plump, 3–4 × 2–3 mm.

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

, herbaceous.

= 22.