Tree, 5-40 m, with large buttresses. Leaves chartaceous to subcoriaceous, obovate to oblanceolate, 8-23 x 3-9 cm, apex shortly and abruptly acuminate or apiculate (often with good 'shoulders'), base narrowly attenuate-cuneate, glabrous except sometimes puberulous on midvein above, glabrous except puberulous on midvein and secondary veins to puberulous except densely so on major venation below; domatia often present; venation eucamptodromous or eucamptodromous-brochidodromous, midvein moderate, prominent, secondary veins 6-16 pairs, moderately spaced to close, arising at moderately to widely acute angles, curved to slightly curved, prominent, intersecondary veins absent, tertiary veins regularly and often closely percurrent; higher order veins distinct; areolation imperfect, slightly prominent; petiole (0.6-)1-3 cm long, sparsely to densely puberulous, usually conspicuously biglandular. Inflorescence 2.5-14 cm long, spicate; peduncle 1.8-3.7 cm, densely rufous-puberulous; rhachis 5-11 cm, densely rufous-puberulous. Flowers 3-4 mm long; lower hypanthium 2-2.5 mm long, probably glabrous to densely pubescent (pilose in type of B. longibracteata), with narrow neck ca. half its length,upper hypanthium 1-1.5 x 2.5-3 mm, glabrous. Fruit glabrous or nearly so even when young, 1.8-2.5 x 0.7-1.5 cm, oblong to oblong-elliptic or narrowly so in side view, more or less terete, apex rounded to acute or apiculate, base rounded and usually shortly pseudostipitate.
Guianas present, Guyana present, Southern America: Brazil North (Acre present); Colombia (Colombia present); Ecuador (Ecuador present); Venezuela (Venezuela present), Western catchment of Amazon river-basin in Brazil present
Western catchment of Amazon river-basin in Brazil, Venezuela, Colombia and Ecuador; the isolated localities in Ecuador and Acre, Brazil, and in Guyana, are outliers but the specimens are quite typical; a single specimen has been seen from the Guianas (GU: 1).