|Natural cactus gardens are common in the rocky slopes of Anza-Borrego.|
|The Ocotillo bush, Fouquieria splendens,|
superficially resembles a cactus.
|In the rainy season, ocotillo sprouts small leaves.|
|Ocotillo flowers are produced in long racemes at the ends of the stems.|
|Ocotillo flowers are narrow-tubular, and pollinated by migrating hummingbirds that feed on their nectar.|
|The common beaver tail cactus in Anza-Borrego is|
Opuntia basilaris. A possible adaptive advantage
of the flattened stem segments is that the
noon-day sun strikes the surface obliquely. This
may reduce the risk of overheating.
|Like all cacti, the flowers of beaver tail cacti have|
numerous petals and stamens.
|Mammillaria dioica is a small barrel cactus, and its stem is shaded by numerous long spines.|
|Cylindropuntia echinocarpa is one of the cylindrical cacti known as cholla.|
|Ferrocactus cylindraceus is another barrel cactus, here bedecked by a ring of flowers.|
|The flowers of Echinocereus engelmannii, a hedgehog cactus, resemble the beaver tail cactus that inhabits the same rocky slopes, but its stems are cylindrical. Photo by Gretchen Craig.|
|In this photo, the green stigmas of Echinocereus are seen in the center of the flower. Photo by Gretchen Craig.|