One of Arizona’s desert flora is the Joshua Tree, or Yucca brevifolia.  They are perfectly adapted to the environment of only the Mojave Desert, just as the Saguaro epitomizes the Sonoran Desert.  Joshua Trees are not really trees, but members of the Agavaceae Family, like Century Plants. They are not Cacti.  They grow very tall, 15 to 40 feet, and can live 150 years or more.  A great place in Arizona to see them is the Joshua Forest Scenic Road from Wikieup to Wickenburg, where I took these photos.