Flora of North America species comparison

erect, stout, 3–7 dm.

3–8 cm;

tendrils simple on proximal leaves, branched on distal leaves;

stipules foliose, approaching leaflets in size, semicordate, with nectariferous patch abaxially;

leaflets 2–6, blades obovate to elliptic, 30–60 × 20–35 mm, margins rarely serrate, apex obtuse, surfaces sparsely pubescent.

1–4-flowered, to 1 cm, much shorter than subtending leaf rachis.

15–30 mm;

calyx base symmetric, lobes unequal, to 2 times as long as tube;

corolla purple, drying black, banner stenonychioid, blade subequal to claw, glabrous;

style compressed abaxially, pubescent apically, tufted abaxially.

black, linear, 30–70 × 10–15 mm, oblique-tipped, glabrous, sutures with pustulate-based bristles;

stipe absent.

4–6, purplish violet to black, subglobose or compressed-globose, 5–6 mm diam.;

hilum whitish, short, oblong, encircling 1/8 circumference of seed.

= 14.