Martretia is a genus of plants in the family Phyllanthaceae first described as a genus in 1907. It contains only one known species, Martretia quadricornis, native to western and central Africa from Sierra Leone to Zaire. It is dioecious, with male and female flowers on separate plants. References Phyllanthaceae Phyllanthaceae genera Monotypic Malpighiales genera Flora of West Tropical Africa Flora of West-Central Tropical Africa Dioecious plants