Both the type of species that Ixia polystachya is and Rhexia are a genus.
The genus Ixia consists of a number of cormous plants native to South Africa from the Iridaceae family and Ixioideae subfamily. 
Rhexia is a plant genus of Melastomataceae (ca. 4500 species in 150 genera) family. 
Ixia polystachya (white-and-yellow-flower cornlily) is an "Ixia" species found on hills and slopes of northwest and southwest Cape, South Africa. 
