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Brazilian Cacti Project
Dedicated to the popularization and?conservation of the Cactus family?(Cactaceae) that occurs in Brazil.
http://www.brcactaceae.org/
British Cactus and Succulent Society
Dedicated to promoting the study, conservation, propagation, and cultivation of cacti and other succulent plants.
http://www.bcss.org.uk/
Day of the Cacti
Echinopsis multiplex cactus collection gone mad, multiplying and populating the planet.
http://www.dayofthecacti.com/
Henry Shaw Cactus Society
Devoted to the study and enjoyment of cacti and succulents.
http://www.hscactus.org/
Mammillarias.net
Provides a description of the flowering cactus genus, discussion forums in English and in French, a field collection number list, and a picture gallery.
http://www.mammillarias.net/
San Diego Epiphyllum Society
All about these hybrids of epiphytic cacti species, sometimes referred to as cactus orchids or epiphytic cactus.
http://www.epiphyllum.com/
The Amateur's Digest
Bi-monthly publication for lovers of cactus, other succulents and caudiciforms; site includes sections on plant/seed suppliers, books for sale and information sharing.
http://www.theamateursdigest.com/
