Diplarrena is a genus of flowering plants in the iris family, Iridaceae. The two species are endemic to Australia. The name is from Greek diploos ("double") and arren ("male"); plants in the genus have only two functional stamens, while all other Iridaceae have three. The name is often misspelled Diplarrhena, an error that began with George Bentham's Flora Australiensis in 1873. There are two species: The cultivar 'Amethyst Fairy' is a large-flowered selection with darker markings on the inner tepals.