Copiapoa - Living on the Edge
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Complete Papers

Aloe    
by Weisser P J, Weisser J N & L Robes 13 (4): 117-118, 1975
by Lembcke H, Weisser P J, 17 (1): 9-26, 1979
by Weisser P J & Laubscher N F 30(3/4): 80-82, 1993
British Cactus & Succulent Journal    

Die Cactaceae

by Backeberg, C. 3 (1995-2023), 1959
Cactaceae Systematics Initiatives 
Cactus and Succulent Journal (USA) 
by P.C. Hutchison 25(2): 34-37, 1953
Cactus and Succulent Journal of Great Britain 
by Taylor, N P 43(2/3): 49-60, 1981 
Calandrinia II 
by Derek Butcher 1982
The Chileans

Echinocactus macracanthus

by Salm-Dyck (Cact. Hort. Dyck. 1849:143 1850)

Echinocactus fiedlerianus

by Karl Schumann :121-122
Haseltonia

by Robert Kraus

13:110, 1995

Kakteen in Südamerika by Friedrich Ritter (3):1044-1107, 1980
Kakteen und andere Sukkulenten    
by L. Diers :363 - 365
by M. Voldan :27(8): 185-186 (1976)
Piante Grasse   Fascicolo 4-Ottobre-Dicembre 1991 - Anno XI - Volume 11
by Massimo Meregalli
by Carlo Doni
PK Notes & Observations by Paul Klaassen  
Succulenta    
Misc.
by Ricardo Keim 2000

by
Rudolf Schulz & Attila Kapitany
by
Paul Klaassen
1996

2002

Berkeley University

All material, except where otherwise credited, is Copyright
 © 2001-2006 Paul Klaassen

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