Euphorbia tricolor Greenm. Euphorbia tricolor Greenm. in Proc. Amer. Acad. Arts 33: 479. 1898 sec. Martínez-Gordillo & al. 2002=Aklema tricolor (Greenm.) Millsp. in Publ. Field Mus. Nat. Hist. Bot. ser. 2(11): 417. 1916 syn. sec. Martínez-Gordillo & al. 2006