General
Chaparral is a shrubland plant community found primarily in California, in southern Oregon, and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean climate (mild wet winters and hot dry summers) and infrequent, high-intensity crown fires.

Many chaparral shrubs have hard sclerophyllous evergreen leaves, as contrasted with the associated soft-leaved, drought-deciduous, scrub community of coastal sage scrub, found often on drier, southern-facing slopes.

Three other closely related chaparral shrubland systems occur in central Arizona, western Texas, and along the eastern side of central Mexico's mountain chains, all having summer rains in contrast to the Mediterranean climate of other chaparral formations. Chaparral comprises 9% of California's wildland vegetation and contains 20% of its plant species.
Source
Wikipedia

Arizona
Chaparral describes a shrub-dominated plant community. In Arizona, this habitat covers approximately 3.5 million acres and typically occurs at elevations between 3,200 and 5,700 feet. Chaparral is characterized by dense, nearly impenetrable thicket dominated by two species of manzanita, acacia, juniper, and shrub live oak. Forbs and grasses are not abundant, mostly due to the high percentage of crown cover. However, this understory vegetation can occur in the scattered interscrub openings or after a fire event. Other conspicuous species present in chaparral include birchleaf mountain-mahogany, skunkbush sumac, silktassels, hollyleaf buckhorn, cliffrose, desert olive, Palmer oak, Arizona white oak, Emory oak, pinyon pine, juniper and desert ceanothus. Succulents such as prickly-pear cactus, agaves, and yuccas commonly grow alongside shrubs. Most wildlife species that occur in chaparral are widespread and common, and SGCN that occupy chaparral also occur in woodland or grassland habitats where chaparral meets those communities at its upper elevation limits, or in desertscrub at lower elevations. Some examples of SGCN include Arizona night lizard, Bezy’s night lizard, and black-chinned sparrow.

Source
azgfd.com