Euphorbia calcicola Fernald Euphorbia calcicola Fernald in Proc. Amer. Acad. Arts 36: 496. 1901 sec. Martínez-Gordillo & al. 2002=Eumecanthus calcicolus (Fernald) Millsp., Publ. Field Mus. Nat. Hist. Bot. ser. 2(11). 414. 1916 syn. sec. Martínez-Gordillo & al. 2006