Flora of North America species comparison

climbing-twining, moderately strigose, hairs loosely appressed, retrorse.

mostly erect, not twining, usually alternately bent at nodes, (10–)20–30(–40) cm, herbaceous, glabrous or glabrate to sparsely strigose, hairs closely appressed, retrorse.

3, blades narrowly oblong to oblong-lanceolate, 25–75 × 6–14 mm, herbaceous, veins not raised, apex rounded to obtuse, surfaces moderately to densely minutely strigulose, with closely appressed hairs.

3, blades oblong or narrowly oblong to narrowly elliptic or oblong-lanceolate, (15–)25–40(–50) × 7–18 mm, leathery, veins closely reticulate (areoles isodiametric) and raised on both surfaces, with a thickened, continuous, marginal vein, apex rounded to obtuse, sometimes retuse, surfaces glabrous.

flowers solitary and axillary or 2–8(–16) in pseudoracemes on distal 1/4 of axis, sometimes in fascicles;

axis 30–120(–280) mm.

axillary, subsessile fascicles, flowers solitary and axillary or 2–6 in reduced pseudoracemes.

calyx 5–6 mm, strigulose;

corolla lavender, 10–11 mm.

calyx 5–6 mm, short-strigose;

corolla pale purple to white, 7–8 mm.

straight, 35–65 × 4–6 mm, sparsely minutely strigulose, hairs closely appressed.

straight or falcate, 20–40 × 5–8 mm, densely hirsute.

12–15.

6–10.