Opuntia oricola to 6 centimeters long. It was common along the coasts and adjacent inland areas of California, but development has reduced its populations. Opuntia oricola Opuntia oricola is a species of prickly pear cactus known by the common name chaparral prickly pear. It is native to southern California and Baja California, where it grows in coastal sage scrub and chaparral habitats. "Opuntia oricola" is a large treelike cactus often exceeding 2 meters in height. The branches are made up of rounded flat segments up to 25 centimeters long. It is covered in clusters of curved, yellowish spines usually around 2 centimeters
Opuntia arenaria strongly deflexed and much shorter. Overall, plants (clumps) of cladodes may be 20–30 cm across and about 4–8 cm tall. Fruits are small, about 2.5 cm. Opuntia arenaria Opuntia arenaria was considered a variety of "O. polyacantha" by many botanists, and is still treated that way in the Flora of North America. However, "O. arenaria" is diploid and "O. polyacantha" is tetraploid. It was described by Engelmann in 1856. "Opuntia arenaria" can grow in soil that is essentially pure sand. It has rhizomes up to 1.5 m long that give rise to above ground shoots with small cladodes that are