Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
Eliasson, U. H. 1996. Aizoaceae. Fl. Ecuador 55: 14–27.
Flora of North America Editorial Committee, e. 2003. Magnoliophyta: Caryophyllidae, part 1. 4: i–xxiv, 1–559. In Fl. N. Amer.. Oxford University Press, New York.
Gibbs Russell, G. E., W. G. Welman, E. Reitief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. v. Wyk & A. Nicholas. 1987. List of species of southern African plants. Mem. Bot. Surv. S. Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).
Hickman, J. C. 1993. Jepson Man.: Higher Pl. Calif. i–xvii, 1–1400. University of California Press, Berkeley.
Jørgensen, P. M. & S. León-Yánez. (editors) 1999. Catalogue of the vascular plants of Ecuador. Monogr. Syst. Bot. Missouri Bot. Gard. 75: i–viii, 1–1181.
Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley.
GREUTER, W., H. M. BURDET & G. LONG (ed.) (1984). MED-CHECKLIST. [vol. 1] Conservatoire & Jardin botaniques de la Ville de Genève. [p.43]
CASTROVIEJO S. & al. (ed.) (1990). Flora Iberica. Real Jardín Botaníco, C.S.I.C. Servicio de Publicaciones. Madrid. [p.90]