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Notes:
This species is characterized by its rather small obovate leaves that do not have domatia; its deeply bilobed stipules; its pedunculate, at least sometimes lax rather small cymes; its rather small calyx limb; and its and rather small white corollas. It was classified by Bremekamp (1963) in his Psychotria Group VI, which was distinguished from his concept of Mapouria by pyrene and seed characters, and Bremekamp considered Psychotria coursii closely related to Psychotria homolleae. However in general aspect and drying color Psychotria coursii seems more similar to species of Mapouria, and Bremekamp noted in its protologue that the fruits and seeds of this species were not known to him, even though he separated Psychotria from Mapouria mainly by fruit and seed characters. Psychotria coursii was described from the area of Lac Alaotra, but this name has been used in herbarium identifications for specimens from throughout central and eastern Madagascar that do not match the original description. In particular Psychotria coursii has been confused with Psychotria ankafinensis, which can be separated by its generally symmetrically elliptic leaves and shorter, usually yellow corollas.
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