Tree up to 50 m, probably briefly deciduous, with simple buttresses up to 5 m high and 1.5 m wide. Leaves chartaceous, oblong-or elliptic-obovate or-oblanceolate, 6-20(-25) x 4-7(-10) cm, apex acute to shortly acuminate, base cuneate (usually narrowly so), sparsely pubescent above and densely so below when young, glabrous or sparsely pubescent only on main veins at maturity; domatia absent; venation brochidodromous to eucamptodromous-brochididromous, midvein stout to moderate, prominent, secondary veins 5-7 pairs, distant, originating at widely acute angles, curved, prominent, inter-secondary veins usually present, tertiary veins randomly reticulate or sometimes weakly percurrent; higher order veins distinct or not; areolation well developed to imperfect, prominent or not.; petiole 0.2-2(-5) cm long, glabrous to pubescent, eglandular or occasionally biglandular. Inflorescence 9-17 cm long, simple, with flowers small, numerous, crowded and all bisexual; peduncle 1-3 cm long, densely pubescent; rhachis 8-14 cm long, densely pubescent. Flowers 5-merous, 2.5-4 x 3-4 mm; lower hypanthium 1.5-2.5 mm long, pubescent to densely so, upper hypanthium campanulate, 1-2 mm long, pubescent; calyx lobes revolute, 0.8-1.5 mm long, pubescent; stamens 3-5 mm long; disk pubescent; style 2-4 mm long, densely villous for at least basal half, sometimes almost so to apex. Infructescence with fruits often disposed along whole length of rhachis; fruit subglabrous at maturity, 1-2.5(-3) x 2-4(-5.5) cm, flattened, transversely elliptic in side view, apex usually emarginate, base truncate or very obtuse, pseudostipe 0.5-3 mm long, wings 2, fairly stiff, equal, 0.8-2.5(-3) cm wide, rounded to narrowly rounded or rarely pointed laterally, body 0.4-0.8 cm wide, ridged on one face, flat or depressed on other.
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