Cubitanthus is a monotypic genus of flowering plants belonging to the family Linderniaceae, with one species Cubitanthus alatus. It was previously placed in the Gesneriaceae, and, still is by some sources.[1] Its native range is Northeastern Brazil.
The genus was erected by Kerry A. Barringer in 1984 for a species originally described in 1828 in Russelia (now a synonym of Vahlia) and then transferred in 1893 to Anetanthus, in the family Gesneriaceae. Molecular phylogenetic studies published from 2013 onwards have shown that it is a basal member of the family Linderniaceae, sister to Stemodiopsis.