Maria, Calaba Polygamous tree, to 35 m high; trunk ca 1 m dbh, buttressed; outer bark with short fissures, thick, irregular on the inner edge; inner bark reddish with white mottling, forming sap droplets; sap yellow, viscid, with the odor of fresh pumpkin; wood white, soft, lightweight; plant glabrous except for dense, minute, ferruginous trichomes on young stems and inflorescences. Petioles 2-4 cm long, stout; blades oblong, rounded to emarginate at apex, mostly obtuse at base, 11-20 cm long, 4.5-9.5 cm wide (to 30 cm long and 8.5 cm wide on juveniles), coriaceous; lateral veins very fine and parallel, secondary lateral veins lacking. Racemes short, to 4.5 cm long; inflorescence branches, petals, and sepals densely ferruginous-tomentose; pedicels less than 5 mm long; buds globose; sepals 4, +/- orbicular to broadly elliptic, concave, ca 6-8 mm long, yellow, markedly unequal in width on a single flower, the outermost wider, about half as wide as long; petals lacking; stamens 10-12; filaments ca 2 mm long; anthers ca 1.8 mm long; ovary ovoid, ca 4.5 mm long; style ca 2 mm long; stigma capitate, much broader than the style. Fruits round, green, ca 3 cm diam; exocarp thin, green; mesocarp +/- corky, thick; endocarp thin, shell-like, containing a single large seed. Croat 8532, Foster 1480. Frequent in the forest, especially in the younger forest. Flowers throughout the rainy season, principally in late rainy season (October to November, rarely as late as January). The fruits mature principally in the late dry and early rainy seasons (March to July). J. Oppenheimer (pers. comm.) reports that white-faced monkeys eat the fruits from May to August. Panama, Colombia, Surinam, Brazil, and Peru. In Panama, known from tropical moist forest in the Canal Zone, Panama, and Darien and from tropical wet forest in Colon and Darien.