Herbaceous vines; stems sparsely pilose in lines or glabrate. Leaves lanceolate to lanceolate-elliptic, apically acuminate, basally acute, truncate, or shallowly cordate, glabrous or glabrate on both surfaces, mostly 5-10 cm long and 2-4 cm wide; petioles pilosulose to glabrous, 1-3 cm long. Inflorescences umbelliform racemose, sometimes bifurcately branched, 5-10-flowered or sometimes twice that number in branched inflorescences, glabrous or nearly so throughout; pe-duncles 5-10 mm long; pedicels slender, 1.5-3.5 cm long. Flowers glabrous throughout; calyx lobes linear-lanceolate to lanceolate, 3-5 mm long and 1-2 mm wide; corolla rotate, green, 2.6-4 cm in diameter, divided nearly to the base, the lobes narrowly to broadly elliptic, 13-19 mm long and 7-9 mm wide, the faucal annulus a thin, broadly 5-angled ridge ca. 0.5 mm high, usually with a triangular group of papillae extending from the angles to the sinuses of the corolla, otherwise glabrous, rarely with the papillae lacking; anther appendages with a central linear appendage which is bifurcate at the apex, the bifurcate lobes usually extended at right angles to the base of the appendage and ca. 0.7 mm long, the non-divided basal portion ca. 0.9 mm long and 0.6 mm wide; the corona thin, fleshy, shallowly 5-lobed, the lobes broadly rounded to triangular, the margins erose-crenulate; gynostegium pentagonal; stigma head slightly depressed. Follicles unknown.
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