Xerotia SynonymyXerotia Oliv. in Hooker's Icon. Pl.: 2359. 1895 sec. Bittrich (1993c)Type: Xerotia arabica Oliv.ContentNotes Notes Monotypic; Arabia. Found to be nested in one of the clades of Polycarpaea by Kool & al. (2012); placement awaits further resolution of polyphyly in Polycarpaea.