Zea perennis (Hitchc.) Reeves & Mangelsd. Zea perennis (Hitchc.) Reeves & Mangelsd. in Amer. J. Bot. 29(10): 817. 1942 sec. Dávila & al. 2018≡Euchlaena perennis Hitchc. in J. Wash. Acad. Sci. 12(8): 207. 1922 syn. sec. Dávila & al. 2006