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.

erect and wiry, villosulous to puberulent, hairs silvery.

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.

trifoliolate;

stipules persistent, linear, 1 × 0.5 mm, apex acuminate;

petiole 1–3 mm, puberulent;

leaflet blades elliptic, 5–20 × 4–10 mm, leathery, gland-dotted abaxially, base cuneate, margins revolute, apex acute to obtuse, frequently apiculate, surfaces puberulent abaxially, finely strigose adaxially.

racemes, longer than leaves, 2–20 cm.

1(2 or 3) simple flowers per axil, longer than leaves, 0.7–1.5 cm.

1–5 mm.

3–5 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 5–8 mm, hirtellous, tube 1.5–3 mm, lobes lanceolate, laterals 4.5–5 mm, lengths to 2.5 times tube, adaxials 1–1.5 mm;

corolla yellow, veined purple;

banner obovate to orbiculate, 8–10 × 7–10 mm, emarginate, glabrous;

wings narrowly oblong, 8.5–10 × 2–2.5 mm, glabrous;

keel 9–10 × 4–5 mm, glabrous;

stamens 10–12 mm.

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

oblong or oblong-lanceoloid, compressed, 10–20 × 5–9 mm, puberulent.

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

brown, black, or mottled, subglobose, compressed, 2–3 × 2–3 mm;

hilum ovate, 0.5–1 mm.

= 22.