Aizoaceae
- Botanical description of this family of succulent plants and shrubs, with illustrations and technical drawings of several species.
- http://delta-intkey.com/angio/www/aizoacea.htm

Achim Hecktheuer's Mesemb Site
- Extensive classification information and photo archive of South African succulents in the aizoaceae family, with emphasis on conophytum and lithops species.
- http://www.mesembs.de/