Natural History
As a landform, Piestewa Peak is relatively young, formed roughly 14 million years ago. However, it is composed of much older rock, primarily schist.
Flora in this area is typical of the lower Sonoran Desert and includes almost all varieties of Arizona cactus such as saguaro, barrel, hedgehog, pincushion, jumping cholla and prickly pear. Trees and colorful shrubbery include palo verde, mesquite, ironwood trees, creosote (dominate), ocotillo, brittle bush, desert lavender and giant sage shrubs.
Wildflowers are abundant in the early spring and include Mexican gold poppies (deep yellow), brittlebush (yellow), lupine (purples), desert globemallow (orange) and scorpionweed (purple). Fiddleneck and bladderpod also are blooming in some areas. These are in addition to the many varieties of flowering cacti.
Reptiles and wildlife that thrive in the preserve are gila monster, horned lizard and chuckwalla. Hikers also can encounter rattlesnakes. The mammal population includes coyote, jackrabbit, cottontail rabbit, ground squirrel and kit fox. There are more than 54 species of birds from the turkey vulture to mockingbirds, cactus wrens, gamble’s quail and several species of owls and hawks.
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—Henry David Thoreau (1817–1862)