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Abstract— A taxonomic revision of the genus Hortia (Rutaceae) is presented. Hortia is a Neotropical genus with most of the species occurring in the Amazonian region. The species are woody, nearly all trees, with simple leaves crowded near the apices of
the branches, showy broad corymbose terminal inflorescences, reddish to pink flowers, and berries with abundant oil glands. Ten species are recognized here, most of them occurring in Brazil. A key to the species, descriptions, synonyms, illustrations, as well as comments on the geographic
distribution, ecology, and economic uses of each species are presented.