Echeveria subrigida (B.L. Rob. & Seaton) Rose Echeveria subrigida (B.L. Rob. & Seaton) Rose in Bull. New York Bot. Gard. 3: 10. 1903 sec. Meyrán & Chávez 2003≡Cotyledon subrigida B.L. Rob. & Seaton in Proc. Amer. Acad. Arts 28: 105. 1893 syn. sec. Rose 1903