Physical Setting
Climate
Adaptations
Tucson Plants
Tucson Animals
External Resources
Physical Setting
Climate
Adaptations
Tucson Plants
Tucson Animals
External Resources

PlantsNative TreesNative ShrubsNative CactusesWildflowersOther Plants

MAJOR TYPES OF CACTI

columnar cactusesCOLUMNAR CACTI: Have cylindrical stems, with ribs (see pleats) running from bottom to top, that are at least 10x taller than wide. Includes species in the genera Carnegiea (Saguaro), Lophocereus (Senita), Packycereus (Cardon), Stenocereus (Organpipe Cactus), and others) .
barrel cactusBARREL CACTI: Have cylindrical stems, with ribs (see pleats) running from bottom to top, that are less than 10x taller than wide and a have a diameter that is greater than about 5". Flowers grow from top of stem. Includes species in the following genera Ferocactus (Fishhook Barrel) and Echinocactus (Many-headed Barrel).
hedgehog cactusHEDGEHOG CACTI: Have cylindrical stems, with ribs (see pleats) running from bottom to top, that are less than 10x taller than wide and have a diameter that is less than about 5". Species occuring here are generally less than 12" tall. Flowers grow from sides of stem. Spines are not hooked (as are many pincushion cactuses). Includes species in the genus Echinocereus (Hedgehog Cactus).
pincushion cactusPINCUSHION CACTI: Have unbranched cylindrical stems, without ribs (see pleats) running from bottom to top. Species occuring here are less than 6" tall. Central spines are often hooked (unlike hedgehog cacti). Includes species in the genus Mammillaria (Fishhook Pincushion Cactus).
cholla cactusCHOLLA CACTI: Have branched, cylindrical stems with jointed segments. Includes species in the genus Opuntia (Chainfruit, Christmas, Staghorn, and Teddybear Cholla). See The Opuntia Difference for more.
prickly pearPRICKLY PEAR CACTI: Have flattened, pad-like stems. Includes species in the genus Opuntia (Prickly Pear). See The Opuntia Difference for more.

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