Opuntia ficus-indica - image Opuntia linguiformis - image Opuntia schumannii - image Opuntia stricta - image Opuntia tomentosa - image Opuntia - Images and brief information on many species. Opuntia - E-mail group for anyone interested in the propagation of cacti, especially the genus Opuntia. Opuntia - Images of O. weberi and O. bigelowii. Opuntia phaeacantha - Desert Prickly Pear - Images from Arizona. Opuntia leptocaulis - Desert Christmas Cactus - Images from Arizona. Genus Opuntia - Description of the genus and its species in the Sonoran Desert, Arizona. Includes illustrations. Opuntia viridiflora - Santa Fe Cholla - Description, image, and range of this rare plant in New Mexico. Opuntia arenaria - Dune Pricklypear - Image, description, and range of this rare plant in New Mexico. Opuntia polycantha - Species summary from the USDA Forest Service. Opuntia humifusa - Species summary from the USDA Forest Service. Looking at a Cactus with the QX5 Microscope - Rudolf Baumueller turns his microscope on the cactus, Opuntia, and produces a photographic study of the plant. Prickly Pear Cactus - Information on these cacti with photographs and descriptions of several species found in Arizona. Opuntia leptocaulis - Photograph and description of the Desert Christmas Cactus and information on its habitat and range. Cholla Cactus: Genus Opuntia - Cholla is a name for various shrubby cacti of this genus with cylindrical stems composed of segmented joints. Photographs and information on several species. Opuntia fulgida - All about the Chain Fruit Cholla, description, photograph, range, habitat and scientific and common names. Opuntia basilaris - Description of the Beavertail Cactus and information on its habitat and range, with several photographs. Opuntia cholla - Information and photographs of the Chain Link Cholla growing in the desert regions of Baja California. Opuntia stricta - Taxonomy, description and photograph of this prickly pear growing in Florida. Opuntia microdasys - General information and classification. Opuntia fragilis - General information and classification. Opuntia dillenii - Photograph of a fine plant in Tenerife, laden with fruit. Eastern Prickly Pear Cactus: Opuntia humifusa - Student project including classification, habitat, adaptation, nutrition, reproduction and interactions with other species.