- Photo (c) Brendan Black, alguns direitos reservados (CC BY-NC), uploaded by Brendan Black Comprehensive check list for Família Crassulaceae
Fonte: Calflora: Information on California plants for education, research and conservation. [web application]. 2012. Berkeley, California: The Calflora Database [a non-profit organization]. Available: http://www.calflora.org/ (Accessed: 07 07, 2012). (Ligação)