Flora of North America species comparison

10–70(–100) cm, proximally glandular-hairy and, sometimes, eglandular-hairy.

7–170 cm, not self-supporting, glabrous, eglandular-hairy, or glandular-hairy;

branches twining.

opposite proximally, alternate distally;

blade ovate to narrowly elliptic, 10–60 × 1–20 mm, surfaces glabrous or hairy.

branches with 1 leaf at each proximal node.

axillary, racemes or flowers solitary.

1–4 mm.

calyx adaxial lobe 3.5–5.5 mm;

corolla white to light purple, often with darker veins, 8–15 mm, adaxial lip 2–5.5 mm.

cleistogamous and chasmogamous;

calyx lobes unequal, glandular-hairy, adaxial lobe 3.5–14 × 1–9 mm;

corolla light purple to white, often dark-veined, 8–17 mm, base gibbous, mouth 2–4 mm diam., palate sometimes purple-veined, convex, 3.5–8 mm diam., puberulent.

ovoid, 4–8 mm, glandular-hairy, abaxial locule with 1 pore.

dark brown to black, 0.7–1.5 mm, tuberculate, reticulate-ridged.

= 30.