Woody vine; stem to ca. 1 cm in diam., bark relatively thin, irregularly thickened; branchlets glabrous; pseudostipules lacking. Leaves: petiole twining, 3-6 cm long; blade chartaceous, elongate elliptic with strongly curved to parallel margins, 8-17(-20) x 5-7 cm, glabrous above, barely pubescent beneath, apex usually acuminate (5-10 mm long), base deeply cordate to auriculate; lateral veins usually marginal at very base. Inflorescence cauliflorous; 1-2 racemes, 2-6 cm long, bearing commonly 10 flowers or many more; bracts small, scaly; pedicels thin, 3.5-5 cm long (in the Guianas, shorter in the type specimen). Flowers: ovary 1-1.5 cm long, thin, glabrous, pink; perianth glabrous, purple brown outside; utricle ovoid, 7 x 4.5 mm; tube funnel-shaped, short, usually less than 1 cm long; limb with 2lateral lobes which are more or less triangular and oblique downward, variable in size, apex round, yellow with brown markings, lower margin fleshy fimbriate. Fruit 6-8 cm long, glabrous; seeds ovoid, 5 x 3 mm, apex acute, base emarginate.
Amazonian regions of Colombia present, Guianas present, Southern America: Peru (Peru present)
Amazonian regions of Colombia, Peru and Brazil, and the Guianas; 18 collections studied (GU: 1; SU: 1; FG: 8).