Tetracoccus dioicus Parry Tetracoccus dioicus Parry in W. Amer. Sci. 1: 13. 1885 sec. Martínez-Gordillo & al. 2002=Tetracoccus engelmannii S. Watson in Proc. Amer. Acad. Arts 20: 373. 1885 syn. sec. Martínez-Gordillo & al. 2006