The correct name of Croton roxburghii N.P.Balakr., nom. illeg. (Euphorbiaceae)

The complicated nomenclatural situation surrounding the names of the widespread species currently known as Croton roxburghii N.P.Balakr. is discussed, and C. mangelong Y.T.Chang is established as the valid name to be used. The confusion with other, superficially similar species is discussed and important differences listed. A lectotype for C. roxburghii is designated.