Monographs Details: Psychotria durifolia Standl.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Discussion:Standley's original description states that the corolla is “not barbate in the throat.” However, dissection of a flower in anthesis indicates the presence of a definite barbate zone of elongate hairs extending from half way up the interior of the corolla tube to its orifice. The pyrenes have a flat ventral face which is shallowly ridged and dorsally have shallowly angled or ridged surfaces. The finely cellular network of the calyx lobes, the continuously winged calyx and hypanthium, with the wings extending the length of these structures, and the winged-angled flowering axes (3-5winged) are shared in the related P. phelpsiana Steyerm. and P. vareschii Steyerm.