L., Sp. Pl. 1191. 1753 Liana; branches usually opposite, the older branches minutely fissured, the younger branches glabrous to puberulent. Leaves opposite; stipules deltoid, ca 2 mm long, widely separated on stem; petioles short, canaliculate; blades usually elliptic to oblong-elliptic, bluntly cuspidate to acuminate and often downturned at apex, rounded to acute at base, mostly 4-11(17) cm long, 2-6 (8) cm wide, glabrous, the margins subentire to crenate, continuous with edges of petiole. Inflorescences axillary and terminal, cymose-paniculate with dichotomous branching, mostly 6-15 cm long, most parts minutely tomentulose; flowers greenish-white or yellowish, with a faint sweet aroma, 5-parted, 6-8 mm diam, short-pedicellate, bracteolate; sepals rounded, minute; petals 3-4 mm long, glabrous at base inside, completely pubescent at apex or bearing an inverted Y-shaped fringe of trichomes; disk prominent; stamens 3, erect at anthesis, hiding style, later folding outward to expose style; filaments flattened; style ca 1 mm long. Mericarps 3, flattened, oblong or elliptic, 4-6 (8) cm long, mostly to 3 cm broad, rounded or deeply emarginate at apex; seeds samaroid, mostly 3.5-5 cm long; seminiferous area apical, darker, 13-25 mm long. Croat 5040, 7275. Southern Florida and Mexico to northern Argentina. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, Panama, and Darien and from premontane wet forest in Colon.

Descripción: Plantas trepadoras o lianas. En los individuos más viejos la corteza exterior del tronco es exfoliante en láminas. Ramitas terminales cilíndricas o ligeramente acanaladas. Hojas simples y opuestas, de 6-12 x 3-5 cm, oblongas o elípticas, con ápice cuspidado o acuminado, bordes aserrados o crenados y base redondeada a obtusa. Estípulas pequeñas. Pecíolo de 0.5-1.6 cm de largo. Flores verde pálidas o amarillentas. Frutos en cápsulas, con tres mericarpos libres, hasta de 8 cm de largo y de 1.5-4 cm de ancho. Semillas aladas, el ala obovada y de 2-4 cm de largo, la parte que contiene la semilla de 1-2.5 cm de largo.

Especies Parecidas: A menudo se confunde con LK ant2pa Anthodon panamense LK2 , pero en A. panamense los tres mericarpos que forman el fruto se encuentran unidos.