General
- Alsterworthia International
- Cacti etc
- Cacti Guide
- Canadian Cactus
- Institute for Aloe Studies
- Lobivia
- National Capital Cactus and Succulent Society
- Resources (Cactus and Succulent Mall)
- Rhipsalis, Lepismium, Haitora, Schlumbergera
- Society of Latin American and the Caribbean for Cacti and Succulents (Spanish)
- Succulent Plant Guide
- The Genus Gymnocalycium
- The Succulent Plant Page
- Too Cold for Cactus
- Tucson Cactus and Succulent Society
Opuntiads
- Additional Species of Opuntia
- Benny's Hardy Opuntia Hybrids
- Cactus Moth Natural History
- Cactus Moth Range
- Cylindropuntia at Flora of North America online
- Grusonia at Flora of North America online
- Hardier Spineless Cacti
- Illustrated Studies of the Genus Opuntia I
- Illustrated Studies of the Genus Opuntia II
- Illustrated Studies of the Genus Opuntia III
- Illustrated Studies of the Genus Opuntia IV
- Mostly Opuntia Articles
- New and Old Species of Opuntia
- New Species of Opuntia 1
- New Species of Opuntia 2
- Opuntia
- Opuntia arenaria
- Opuntia at the Flora of North America
- Opuntia del Sur
- Opuntia in Madagascar
- Opuntia paraguayensis reassessed
- Opuntia treatment at USDA NRCS
- TephroWeb
- Too Cold for Cactus
- Which Opuntia are invasive species?
- Yahoo Opuntia Group
Reading
Vendors
- Gymnocalycium
- Kara Cactus and Succulent Nursery
- Mesa Garden (many opuntiads)
- Miles to Go Cacti and Succulents
- Penroc Seeds and Plants (African succulents and other plants)
- Peppermania–all things chilli pepper
- Silverhill Seeds and Books (African succulents and other plants)
- SuccSeed (many South American cacti)
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