Flora of North America species comparison

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

erect and wiry, villosulous to puberulent, hairs silvery.

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.

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.

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

bracts present, striate.

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

3–5 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.

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.

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

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

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

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

hilum ovate, 0.5–1 mm.

= 11.