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The Ecuadorian members of the tribe Hippotideae (Rubiaceae) are revised. There are three genera and 22 species documented from, or considered likely to occur in Ecuador: Hippotis (7 spp.), Pentagonia (13 spp.), and Sommera (2 spp.). Five species are described as new: Hippotis comosa, Pentagonia breviloba, P. microcarpa, P. subsessilis and P. villosula. One new combination is made, Pentagonia amazonica (Ducke) L. Andersson & J. Rova. All taxa are described, keys are provided for each genus, and specimens are cited for all species. Selected species are illustrated.