Dioecious twining vine, nearly glabrous; stems conspicuously 4-winged on the angles. Leaves alternate; petioles to 15 cm long; blades cordate, 3-5-lobed, 6-23 cm long, as broad as long, glabrous to minutely puberulous on upper surface and on the veins below, pellucid-lineolate, not obviously glandular, the lobes acute to acuminate, the terminal lobe with 3 veins; veins 9-13, palmate. Staminate spikes axillary, 2-5 per axil, their flowers greenish, solitary, short-pedicellate, the ovary pubescent; tepals 6, oblong-lanceolate, to 2.7 mm long; stamens 6, all fertile, ca 1.3 mm long, attached to tepals; anthers introrse; pistillate flowers not seen. Capsules 3-winged, ca 2.7 cm long and 1.7 cm wide (fide Morton (1945) in Flora of Panama), puberulent. Croat 7242. Cultivated at the Laboratory Clearing. Seasonal behavior uncertain. Probably flowering and fruiting in the dry season.