Some of the information in this lexicon has been obtained from the following books and periodicals and the internet (--> Links):
(This list is not complete)
Books:
Backeberg, Curt: Die Cactaceae
Berger, Alwin: Kakteen
Blum, Felix & Waldeis: Echinocereus. Die Sektion Wilcoxia. Der Echinocereenfreund. Sonderausgabe 2008
Britton & Rose: The Cactaceae
Bruyns, Peter V. : Stapeliads of Southern Africa and Madagascar
Periodicals:
