Monographs Details: Psychotria guadalupensis subsp. tetrapyrena (Urb.) Steyerm.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.

Psychotria pendula subsp tetrapyrena Urb., Symb. Ant. 1: 445. 1900.

The minute calyx projections from a nearly truncate summit, together with the fleshy, subsessile leaves, characterize this subspecies from Cuba and set it apart from the other West Indian subspecies, all of which have more conspicuous calyx lobes.