Monographs Details: Platycarpum duckei Steyerm.
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Family:Rubiaceae
Description:Species Description - The following details may be added to the original description: Petiolar gland on lower side of petiole at base, 1-1.5 mm broad, 4-5 mm long, not curved or bent; calyx 9-10 mm long, the calyx-tube 2-4 mm long; fruiting capsule oval-oblong, longer than broad, 4.5-5 cm long, 3.5-4 cm broad, the valves about 1 mm thick.