Juniperus deppeana Cypress Family Cupressaceae 4,500' to 8,000' 500 to 800 years Evergreen; largest juniper species in Arizona. Mature trees recognized by alligator-like bark. Populus tremuloides Willow Salicaceae Smooth bark, older trees are gray, thick, furrowed. Opuntia engelmannii Cactus Cactaceae 1,500' to 5,000' Most common prickly pear in Arizona. Pollinated by bees. Fruits, called tunas, eaten by birds and rodents; also used for jelly and making red dye. Javelinas eat pads. Opuntia violacea Cactus Family Cactaceae 2,000' to 5,000' Purple tinged pads. Proboscidea parviflora Unicorn Martyniaceae 1,000' to 5,000' Annual herb. Entire plan is very sticky. Cercocarpus montanus Rose Rosaceae 1,000' to 5,000' Annual herb. Entire plan is very sticky. Agave parryi Agavaceae 25 years 25 years to send up 12 to 18' flowering stalk, then dies. Carnegiea gigantea Cactus Family Cactaceae sea level to 4000' 200 years Largest cactus in the United States, commonly reaching 40 feet tall. The cylindrical stems are accordion-pleated; the ribs are lined with clusters of hard 2" spines along the lower 8 feet and flexible bristles above. White flowers bloom mainly in May and June and are followed a month later by juicy red fruit. A tap root extends downward to more than 2 feet. It takes 40 years to reach about 3', if it makes it at all. The Saguaro Cactus is Arizona's state flower.