barrel cactus and other cacti in the semi desert landscape on usery mountain

activities along arizona barrel blue cacti cactus catuses cave cholla clouds county desert environment flora forest formations geological geology hiking landscape layers maricopa mountain national nature near ocotillo other outdoors park pass phoenix plants precambrian prickly reginal reserve rock rocks saguaro sates scarface semidesert shadow shrubs spectacular tonto trail trails united usery valley vascular views vista wilderness wind windy