Monographs Details: Psychotria ligularis (Rudge) Steyerm. var. ligularis
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Discussion:

Schradera ligularis Rudge, Pl. Guian. 1: 29. pl. 45. 1805.

This is the narrow-bracted form of involucre, actually the rarer variation, figured in Rudge’s Plantarum Guianae rariorum icones et descriptiones (pl. 45) under Schradera ligularis. This corresponds to the specimen in P labelled “Schradera ligularis” in which the bracts of the involucre are linear-oblanceolate to oblanceolate, acute at apex, and narrowed at base, the shorter involucral bracts 1 cm long by 2-2.5 mm broad, the larger outer ones 2.5-3 cm long by 6-7 mm broad.