Monographs Details: Psychotria concinna Oliv.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Discussion:The collection of Cardona 253 from Auyan-tepui was labelled by Standley as a new species of Palicourea, but was left unpublished. Psychotria concinna was described by Oliver from a collection from Mount Roraima, based on a small-leaved variation of the plant with acute to acutish leaves. Although Oliver described the leaves as “acutis vel acutiusculis,” many of the specimens now at hand show an obtuse or subobtuse apex (Steyermark 58813 from the type locality) or even rounded (Wurdack 34179 in part). There is also shown a great range of leaf size even on the same branch (Pinkus 148 from the type locality and Wurdack 34179). The corolla also varies from small-sized on dwarfed individuals (Steyermark 58787) to larger-sized (17-18 mm long) on other specimens. When the flowers are measured as dried specimens, they often are only 10 mm long. Flowers beginning to expand, as well as smaller-flowered specimens, are often as little as 12-14 mm long, the measurements given in the original description. However, boiled dissected flowers are usually 16-18 mm long.