Alternanthera, Fl. Aegypt.-Arab.: 28, 59. 1775 sec. Townsend (1993)
The genus Alternanthera is well supported as monophyletic in the current circumscription and is characterized by the presence of capitate stigmas and in most species also distinct androecial appendages that alternate with the filaments. The previously recognized genera do not represent natural entities except Mogiphanes which is nested within one of the two major subclades of Alternanthera (Sanchez del-Pino, Motley & Borsch 2012).