Flora of North America species comparison

twining, solid, sericeous.

stipules retrorse, lanceolate or ovate, 5–6 × 1.8–2 mm;

petiole 3.5–8 cm, canescent;

rachis 5–8 mm;

stipels linear, 1.2–2.5 mm;

leaflets papery, blades elliptic or ovate, base cuneate or obtuse, apex acute, surfaces often canescent abaxially, strigose adaxially;

lateral blades 3.3–4 × 2.7–3.3 cm, 2-lobed, terminal blades often hastate, 4.5–4.7 × 3–4.3 cm.

26–36 cm, axes pilose;

tufts of bracts at base of peduncle persistent, 5.5 mm, lanceolate, canescent;

extrafloral nectaries conspicuous at nodes;

bracts and bracteoles lanceolate or subulate.

1–2 mm.

1.7–3 cm;

calyx campanulate, 6.2–8 mm, canescent, calyx lobes shorter than tube;

corolla purple-black;

banner oblong, 13–17 × 9–10.4 mm;

wings obovate, 13–24 × 8–14.3 mm;

keel 9–16 mm;

ovary nectary disc distally oblique;

ovules 13.

patent, linear, 7–10 × 0.3–0.4 cm, valves twisting at dehiscence.

12 or 13, oblong, 3.5–5.2 × 2–3.2 mm.

, perennial;

root elongate.

= 22.