Monographs Details: Psychotria kaieteurensis Sandwith
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. British Guiana. Dicymbe forest, Kaieteur Plateau, trail from Kaiatuk to Tukeit, 12 May 1944, Maguire & Fanshawe 23475; Tumatumari, 18 Jun-8 Jul 1921, Gleason 117.

Discussion:

Type. Potaro River, sandy forests at top of the Kaieteur Gorge, by path descending to Tukeit, alt 303 m, 7 Sep 1937, Sandwith 1429.

Sandwith relates this species to P. cuspidata Bredem. ex R. & S., but it is obviously more closely related to the group of P. deflexa DC., and particularly P. subundulata Benth., because of the conspicuously dorsally ridged pyrenes, as noted in Maguire & Fanshawe 23475. Nor does P. kaieteurensis show the conspicuous corniculate appendages of the corolla buds, a character of true P. cuspidata. In his original description, Sandwith described the ovary as “glabrum,” but a study of the type collection, as well as the other specimens cited above, shows the ovary to be truly minutely puberulent, as observed under a dissecting microscope.

This taxon can be distinguished from the related P. subundulata Benth. by the much larger corolla, the larger and longer bracts scattered at the main forks of the inflorescence, and by the thicker axes of the inflorescence.

Distribution:Guyana South America|