Aubl., Hist. Pl. Guiane Fr. 1:83.1775
R. darienensis Pitt.
Tree, to 20 m tall; wood aromatic when cut; young stems ferruginous-strigillose. Leaves alternate, heteromorphic; juvenile leaves pinnately compound, imparipinnate, the leaflets to ca 19, coarsely serrate; adult leaves simple; petioles 1-6 cm long; blades ovate, mostly acute or acuminate at apex, obtuse to cuneate at base, 5-12 cm long, 2-9 cm wide, subcoriaceous to coriaceous, grayish-green, mostly entire to undulate, rarely serrate, glabrous but the midvein above ferruginous-strigillose. Flowers cream-colored, on multi-flowered, terminal or axillary racemes; rachis 9-18 cm long, ferruginous-strigillose; pedicels
ca 3 mm long, strigillose; sepals 4, linear-oblanceolate, ca 8 mm long, widely reflexed, strigillose outside, glabrous inside; petals lacking; stamens 4, inserted about midway on sepals, strap-shaped, ca 3 mm long, nearly sessile; disk of 4 hypogynous glands alternate with sepals; ovary densely strigose; style and stigma linear-oblanceolate, together ca 5.5 mm long, glabrous. Follicles flattened, elliptic to obovate, 2.5-4 cm long, ca 1.5 cm wide, glabrous, often obscurely spurred at base; seeds 2, oval, winged, ca 1.5 mm long and 8 mm wide. Croat 14647.
Seen only once at the junction of Snyder-Molino and Barbour trails. Flowers January to May. The fruits reported in June.
Mexico to Peru, Bolivia, and Brazil. In Panama, widespread and ecologically variable; known from tropical moist forest in the Canal Zone, Veraguas, Herrera, Coclé, Panama, and Darien, from tropical dry forest in Coclé, and Panama, from premontane moist forest in the Canal Zone and Panama, from premontane wet forest in Chiriqui, Coclé, and Panamá, and from tropical wet and lower montane rain forests in Darien.