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Notes:
This species is characterized by its dark brown drying color, its small leaves generally that are oblanceolate or obovate, its small bilobed stipules, its ferrugineous-hirtellous stems, its three to five small, 5-merous flowers borne on short peduncles (ca. 2 mm), and its red fruits. There are several similar Psychotria species with some of the same characters but not all of these in this combination. Psychotria ambohimitombensis as circumscribed here has been collected infrequently. However in general Psychotria ambohimitombensis and Psychotria haplantha are similar, and if there is variation in their populations in how many flowers are produced, whether the flowers are sessile or pedunculate, and the length of the calyx limb, then the separation of these two species needs reevaluation. The typification of Psychotria ambohimitombensis was clarified by Gautier & Taylor (Candollea 66: 122-123, 2011).
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