Monographs Details: Chorisepalum psychotrioides Ewan
Authority: Maguire, Bassett. 1978. The botany of the Guayana Highland--part XI. Mem. New York Bot. Gard. 32: 1-391.
Discussion:3. Chorisepalum psychotrioides Ewan, Jour. Wash. Acad. 37: 394, fig IB, C. 1947.
By floral and vegetative distinction I am unable to separate the entire series of specimens cited here into two lots representing the names Chorisepalum psychotrioides Ewan and C. acuminatum Steyermark. However, as indicated by the collectors' labels, populations of the regions of Cerro Venamo and the northern escarpment of the Gran Sabana in the headwater drainage of the Río Cuyuni characteristically are of a scandent habit. More southern populations ranging from Ptari-tepui into Guayana are upright shrubs or small trees, often virgate. The type of C. psychotrioides, Steyermark 59707, falls into this latter grouping.
I have retained the epithet acuminatum for the northern scandent populations.