Monographs Details: Dicymbe altsonii Sandwith
Authority: Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.

Trees of this species 20-35 m tall and 30-60 cm in diameter have been measured. It is in some sections of British Guiana very common, if not the dominant tree.

The size of the flower parts is variable, the petals especially; the one large petal varies from 2.5 to 3.5 cm in diameter and the other four from 1.5 to 2.2 cm in width. The filaments in the type collection vary from 7-17 mm in length while in a later collection they range from 15 to 25 mm long. The cupular hypanthium, free bracteoles, and inequal androecium relate this species to D. heteroxylon; the latter has narrowly lanceolate leaflets and smaller flowers.

The fruit was not known at the time of the original description but now a specimen with fruit has been collected. It is sericeous, alate at the dorsal margin, oblong, about 14 cm long and 4 cm wide. The seeds are compressed, oval in outline, 28-33 mm long, 24-26 mm wide.

Besides the type collection, Altson 459, the following collections represent this species: BRITISH GUIANA: Bartica-Potaro Road, Fanshawe 1057 (F. D. No. 3793), 2702 (F. D. No. 5495), 2749)(F. D. No. 5548).