Slender vine; stems, petioles, and upper midrib of leaves densely pubescent. Leaves alternate, sessile or with slender petioles to 7 mm long, unequally palmate, with 3-5 lobes, the central lobe longest, 4-10 cm long, the lateral lobes 1-3 cm long, all lobes +/- crenate, moderately to sparsely pubescent. Sporangia sessile, borne in narrow, pubescent, conelike clusters along margins. Croat 7216. Abundant in old clearings; less frequent in the forest along margins of clearings. Mexico to Peru; West Indies. In Panama, known principally from tropical moist forest in the Canal Zone, Colón, Chiriqui, Herrera, Coclé, Panama, and Darien; known also from tropical dry forest in Panama (Taboga Island), from premontane moist forest in Panama (Saboga Island), and from premontane wet forest in Chiriqui and Panama (Chimán).