Cactus is the name given to any member of the flowering plant family Cactaceae. Cacti are almost exclusively New World plants. This means that they are native only in North America, South America, and the West Indies. There is however one exception, Rhipsalis baccifera; this species has a pantropical distribution, occurring in the Old World in tropical Africa, Madagascar and Sri Lanka as well as in tropical America. This plant is thought to be a relatively recent colonist in the Old World (within the last few thousand years), probably carried as seeds in the digestive tracts of migratory birds. Many other cacti have become naturalized to similar environments in other parts of the world after being introduced by people.
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Cacti and Succulents :: Plants
Desert Plants :: Deserts

Cacti Guide - Images of many genera, mostly of small, planted specimens.
Cactus Museum - Photos and notes for many species from a cactus grower in Tucson, Arizona.
Meta Description: [ An online museum covering the cactus family (Cactaceae). Also provides cactus-related information and link pages, an online cactus and succulent store, and a cactus forum. ]
Coryphantha - Classification information, photo galleries, bibliography, distribution maps, and link directory. [German, English]
Keir's Botanical Photo Archive - Cactaceae - Images from the US.
Meta Description: [ Pictures of plants in the Cactaceae family ]
Mark Faint's Cactus Page - Detailed information on Neolloydia, Notocactus, and Turbinicarpus.
Meta Description: [ The home page of Mark Faint - Info on Cacti and Succulents ]
Outdoor Cacti Photos - Photos of Opuntia, Echinocereus, and others, resources, and tips for growing and photographing them.
Meta Description: [ Showcasing some of the best outdoor cacti photographs, including photographing and growing outdoor cacti in cold climates. ]
Peterocactus National Plant Collection - List of the nine species, endemic to southwestern Argentina, with images and brief descriptions of four.
Plants of the Cactaceae Family - Large image gallery of cacti cultivated in Phoenix, Arizona.
Meta Description: [ Description of a group of plants belonging to the Cactaceae family growing in Phoenix. ]
Rhipsalis, Lepismium, Hatiora, Schlumbergera - Information on plants in these four genera, including species lists with photos, cultivation and propagation details, and links to vendors and collections.
Meta Description: [ A guide to Rhipsalis, Lepismium, Hatiora, Schlumbergera. ]
Southwestern Cacti - Information and photos for species native to the southwestern United States.
The Cactaceae - Description of the cactus family, with photos and short profiles of several representative species.
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