Vines; stems twining, much branched, herbaceous to somewhat woody near the base, perennial, the stems appressed-pubescent to glabrate. Leaves rounded- ovate, commonly with 3 lobes, 5-9 cm long, basally cordate, apically acuminate, densely pubescent to glabrate. Flowers in 1- to few-flowered cymes, the cymes usually silky white-pubescent; sepals lanceolate to ovate to broadly-ovate, 10- 20 mm long, apically acuminate to long-acuminate, appressed pubescent to glabrate; corolla blue or purple, rarely white, 5-7 cm long, the limb 6-8 cm broad. Fruits capsular, to 1 cm broad, globose to somewhat apically flattened depending on the number of seeds developing, glabrous; seeds commonly 4, tan to dark brown, glabrous.
Sepals lanceolate, 1.4–2.2 cm. long, 3–5 mm. wide, herbaceous, glabrescent or softly pubescent, particularly at the base, but not bristly.
Flowers few to several in fairly dense cymes; peduncle hairy, 0.5–20 cm. long; pedicels 2–15 mm. long.
Leaf-blade ovate, 5–17 cm. long, 3.5–16 cm. wide, entire or sometimes 3-lobed, acuminate at the apex, cordate at the base, pilose above and sometimes densely so beneath; petiole 2–18 cm. long.
Herbaceous plant; stems twining or prostrate and rooting at the nodes, pilose.