The Cactaceae
Description of the cactus family, with photos and short profiles of several representative species.
Cactus Museum
Photos and notes for many species from a cactus grower in Tucson, Arizona.
Outdoor Cacti Photos
Photos of Opuntia, Echinocereus, and others, resources, and tips for growing and photographing them.
Mark Faint's Cactus Page
Detailed information on Neolloydia, Notocactus, and Turbinicarpus.
Plants of the Cactaceae Family
Large image gallery of cacti cultivated in Phoenix, Arizona.
Peterocactus National Plant Collection
List of the nine species, endemic to southwestern Argentina, with images and brief descriptions of four.
Cacti Guide
Images of many genera, mostly of small, planted specimens.
Keir's Botanical Photo Archive - Cactaceae
Images from the US.
Description of Cactaceae
Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.
Southwestern Cacti
Information and photos for species native to the southwestern United States.
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