- Cacti Guide - Images of many genera, mostly of small, planted specimens.
cactiguide.com
- Cactus Museum - Photos and notes for many species from a cactus grower in Tucson, Arizona.
www.cactusmuseum.com
- Description of Cactaceae - Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.
www.keil.ukans.edu/delta/angio/www/cactacea.htm
- Mark Faint's Cactus Page - Detailed information on Neolloydia, Notocactus, and Turbinicarpus.
www.mfaint.demon.co.uk/cactus
- Outdoor Cacti Photos - Photos of Opuntia, Echinocereus, and others, resources, and tips for growing and photographing them.
www.xmission.com/~mbmiles
- Peterocactus National Plant Collection - List of the nine species, endemic to southwestern Argentina, with images and brief descriptions of four.
www.manntaylor.com/ptero.html
- Plants of the Cactaceae Family - Large image gallery of cacti cultivated in Phoenix, Arizona.
www.desert-tropicals.com/Plants/Cactaceae
- Southwestern Cacti - Information and photos for species native to the southwestern United States.
arizona.cacti.home.att.net/cacti.htm
- The Cactaceae - Description of the cactus family, with photos and short profiles of several representative species.
www.botany.hawaii.edu/faculty/carr/cact.htm
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