Monographs Details: Platycarpum rhododactylum Woodson & Steyerm.
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Description:Species Description - Examination of additional material makes it necessary to emend the original description as follows: Leaf-blades 3-12 cm wide, broadly ovate to ovate-elliptic or oblong-elliptic; petiolar gland at very base of petiole on lower side, slightly narrowed at each end but mostly oblong, 2-4 mm long, 1.2-2 mm high; inflorescence condensed, 5-7 cm long, 4.5-6 cm broad, peduncle suppressed or the first elongated node 3-6.5 cm long; calyx-tube 2-3 mm long, calyx-lobes 5-8 mm long, 3-4 mm wide; corolla-tube 11-13 mm long; corolladobes 3-5 mm long; capsule 3.5-4 cm broad, 2.5-3 cm long, broader than long; seed suborbicular-ovate, broadly winged, 2.7-3 cm long, 1.5-2 cm broad, the central body olive-brown, 1.2-1.5 cm long, 1-1.1 cm high, the winged portion 3-7 mm wide and rufous-brown, the testa conspicuously and densely papillate.