Flora of North America species comparison

climbing or suberect, young growth densely strigose, hairs not uncinate, glabrescent.

alternate, odd-pinnate, pulvinate;

stipules present, sessile, not produced below point of insertion;

petiolate;

leaflets 3, stipels present, blade margins entire, surfaces glabrous or strigose.

5–10[–30]-flowered, axillary, pseudoracemes, rachis with swollen nodes;

bracts and bracteoles present, bracteoles subpersistent, elliptic-rounded.

shorter than calyx tube.

papilionaceous;

calyx campanulate, lobes 5;

corolla red-purple or white, 12–15 mm, glabrous, banner with 2 prominent appendages at base, wings relatively long, enclosing keel, keel narrow, beaked;

stamens 10, diadelphous;

anthers basifixed and dorsifixed, alternate, dehiscing laterally, pollen tricolporate;

ovary straight, nectary disc at base, style laterally flattened with brush on internal face, stigma terminal.

legumes, sessile, dark purple, compressed, usually oblong-falcate, 5–10 cm, tipped by persistent style, dehiscent, ventral sutures verrucose, glabrescent.

2–5, white or reddish brown to black, oblong, 9–13 mm;

with long, lateral hilum covered by conspicuous linear, white rim aril, extending more than 1/2 seed length.

= 11, 12.