Notes:
This species is characterized by its glabrous condition; its often rather robust, narrowly oblanceolate leaves with the venation not visible or the secondary veins weakly evident and the upper surface not markedly shiny; its stipules that are united around the stem with one triangular, generally well developed lobe on each interpetiolar side; its inflorescences that have a short to developed peduncle or are sessile and fasciculate; its subsessile flowers; its truncate rather well developed calyx limb; and its somewhat large fruits (6-9 mm long) that are white then blue then black. Psychotria mangorensis is similar to Psychotria nossibensis, but that has a longer calyx limb, generally 4-8 mm long, and a distribution in northwestern Madagascar. Psychotria mangorensis is also similar to Psychotria menalohensis and Psychotria onivensis, but those species generally have shorter, stiffer, quite shiny leaves with the venation readily visible and rounded to obtuse stipules. Psychotria mangorensis appears to be rather widely distributed but not common locally.
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