Flora and Fauna
- 4886
- Barrel Cactus: Genus Ferocactus
- Information on this family of cacti, with photographs and descriptions of several species found in Arizona.
- 4890
- Echinocereus Online
- An electronic magazine about the genus, in German and English. Includes many images.
- 4892
- Anhalonium Lewinii: Mescal Buttons
- Information from Botanical.com, a modern herbal, on this cactus, now classifies as Echinocactus Lewinii, its description, constituents, medicinal action and uses.