Flora of North America species comparison

usually prostrate, rarely climbing, strigose or villosulous, hairs cinereous, appressed or slightly spreading.

prostrate or twining, tomentulose, hairs silvery or grayish.

usually trifoliolate, proximalmost sometimes unifoliolate;

stipules persistent, lanceolate-ovate, 2–5 × 1–2 mm, apex acuminate;

petiole strigulose;

leaflet blades oval to orbiculate-ovate, obovate, or rhombic, 15–35 × 6–50 mm, leathery, gland-dotted, base obtuse or subcordate, apex obtuse or acute, surfaces hirtellous abaxially, rugose and finely strigose adaxially.

trifoliolate;

stipules persistent, subulate, 1–2 × 0.5–1 mm, apex acute to acuminate, surfaces tomentulose;

petiole 4–30 mm, tomentulose;

leaflet blades obovate or elliptic-lanceolate, 10–45 × 5–20 mm, leathery, gland-dotted, base obtuse, apex usually rounded or obtuse, rarely acuminate, surfaces strongly reticulate and densely grayish tomentulose abaxially, densely grayish tomentulose adaxially.

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

racemes, shorter than or equal to leaves, 2–6 cm.

1–4 mm.

2–4 mm, viscid.

calyx 10–12 mm, hirtellous, tube 2 mm, lobes lanceolate, laterals 9–10 mm, lengths 3+ times tube, adaxials 3–3.5 mm;

corolla light yellow;

banner obovate, 8–11 × 6–8 mm, emarginate, puberulent;

wings oblong, 8.5–13 × 2.5–3 mm, glabrous;

keel 8–9.5 × 3–4 mm, glabrous;

stamens 8–10 mm.

calyx 5–7 mm, tomentose, viscid, tube 2–2.5 mm, lobes lanceolate, laterals 4–5 mm, lengths to 2.5 times tube, adaxials 2.5–5 mm;

corolla pale yellow;

banner suborbiculate, 8–10 × 6–7 mm, emarginate, puberulent, gland-dotted;

wings oblong, 8–9 × 2.5–3 mm, glabrous;

keel 8–9.5 × 2–2.5 mm, glabrous;

stamens 8–10 mm.

ovoid-oblong, compressed, 13–17 × 6–8 mm, puberulent.

ellipsoid, compressed, 15–17 × 4–6 mm, yellow-hirsute and puberulent, hairs intermixed.

brown, black, or mottled, subglobose, compressed, 2.5–4 × 2–4 mm.

brown, black, or mottled, ovoid-ellipsoid, compressed, 2.5–4 × 2.5–3 mm;

hilum linear, 1–1.5 mm.