Corispermum, Sp. Pl.: 4. 1753 sec. Kühn 1993
Corispermum comprises c. 60–65 annual psammophytic (rarely glareophytic) species naturally distributed mainly in Eurasia, with less than 10 species native in North America (Mosyakin 1995). Species delimitations and distribution are poorly understood because of high morphological variability and possible recent explosive radiation of local races. There is one molecular phylogenetic study of Corispermum by Xue & Zhang (2011) that is limited to Chinese species and shows a rather poor infrageneric resolution. The genus is in need of a taxonomic revision based on comprehensive molecular phylogenetic and morphological studies.