Tree to at least 15 m tall and 50 cm d.b.h.; crown spreading; twigs pubescent, often hollow. Leaves imparipinnately compound, mostly 7-9-foliolate, the leaflets opposite or subopposite, each leaflet elliptic to elliptic-obovate, rounded at the tip and base, 1.9-11.6 cm long and 1.4-6.8 cm wide, proximal leaflets smallest and the terminal leaflet largest, the surface strongly minutely papillose and ir- regularly lepidote, pubescent with simple trichomes on main veins above and beneath and to some extent over the undersurface, petiole 3.3-4.0 cm long. Inflorescence a pendent simple panicle with the central axis greatly elongated, flagelliflorous, hanging below lower branches. Flowers with the calyx cupular, irregularly 5-dentate, 2.5-4.5 cm long and 1.6-2.7 cm wide, glabrous or sub- puberulous, usually with glandular fields in the upper part; corolla deep maroon inside, maroon streaked with green outside, campanulate above a tubular base, glabrous with a glandular epidermis, pubescent at the level of stamen insertion, 7-9 cm long and 4-6 cm wide at the top of the tube; stamens didynamous, subex- serted, the anther thecae slightly divergent, 7-9 mm long and 1.5 mm wide, the filaments basally pubescent, the longer pair 4.9-5.1 cm long, the shorter pair ca. 4.3-4.5 cm long, the staminode 4-5 mm long, inserted 1.2-1.3 cm above base of tube; pistil 6-6.5 cm long, the ovary cylindrical, 10-11 mm long and 3 mm wide, more or less glandular-lepidote, unilocular with 2 bifid parietal placentae at the top, bilocular with 2 axile placentae in each locule for most of the length, the ovules ca. 10-seriate in each locule; disc very large, annular-pulvinate, 3 mm long and 12-13 mm wide. Fruit cylindric with rounded ends, large, pendent, indehiscent, to at least 80 cm long and 8 cm wide, rarely set in Panama.