Didymocistus is a genus of plants in the family Phyllanthaceae first described as a genus in 1940. It contains only one known species, Didymocistus chrysadenius, native to the Loreto region of northeastern Peru, the Amazonas Department of southeastern Colombia, and the State of Amazonas in northwestern Brazil. It is dioecious, with male and female flowers on separate plants. References Phyllanthaceae Flora of the Amazon Monotypic Malpighiales genera Phyllanthaceae genera Dioecious plants