Flora of North America species comparison

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

prostrate, procumbent, twining, ascending, or erect, pubescent or glabrous.

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.

alternate, unifoliolate or trifoliolate;

stipules present, striate;

petiolate;

stipels deciduous;

leaflets 1 or 3, 0.5–2.5 mm, blade margins entire, surfaces gland-dotted abaxially, sometimes also adaxially, pubescent or glabrous.

racemes, shorter than leaves, 1.5–5 cm.

1–3-flowered, usually axillary, rarely terminal, usually racemes;

bracts present, striate.

2–5 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.

papilionaceous;

calyx campanulate with relatively long lobes, or tubulous-campanulate with relatively short lobes, lobes 5;

corolla yellow, yellow-orange, or green-yellow, often with purple or brown tinge or streaks, (4–)6–12(–14) mm;

stamens 10, diadelphous;

anthers dorsifixed.

legumes, sessile or subsessile, usually compressed, ovoid to ellipsoid, falcate, or acinaciform, beaked, dehiscent, gland-dotted, pubescent or glabrous.

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

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

1 or 2, subglobose, ovoid to ellipsoid, or reniform.

, herbaceous.

= 11.

= 22.