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Devoted to studying, growing and sharing desert plants.
http://www.arizonacactus.com/
Devoted to cacti and succulent plants.
http://www.cactus.it/
Dedicated to the popularization and conservation of the Cactus family (Cactaceae) that occurs in Brazil.
http://www.brcactaceae.org/
Dedicated to promoting the study, conservation, propagation, and cultivation of cacti and other succulent plants.
http://www.bcss.org.uk/
Resource for all growers of cacti and succulent plants.
http://www.cactus-mall.com/
Echinopsis multiplex cactus collection gone mad, multiplying and populating the planet.
http://www.dayofthecacti.com/
Devoted to the study and enjoyment of cacti and succulents.
http://www.hscactus.org/
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/
All about these hybrids of epiphytic cacti species, sometimes referred to as cactus orchids or epiphytic cactus.
http://www.epiphyllum.com/
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/