Flora of North America species comparison

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

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

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.

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.

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

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

bracts present, striate.

1–6 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.

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

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

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

= 11.

= 22.