Potamophila  

Ehrhartoideae. --The ehrhartoid grasses (subfamily Ehrhartoideae), as presently classified, comprise the tribes Ehrharteae, Oryzeae, Phyllorachideae and Streptogyneae (Judziewicz & Clark, 2007), although only the first two were placed in this subfamily previously on the basis of molecular sampling (GPWG, 2001). The subfamily comprises 21 genera and 111 species in GrassWorld (Table 2).