The Arizona Upland desert occupies the eastern and northern margins of the Sonoran Desert.  It has a spectacularly diverse flora, rich in large cacti and trees.

at the top of the Silverbell transect, just w. of Tucson, Arizona prominent are saguaro and barrel cacti, bursage, and palo verde trees	near Quijotoa,  s. central Arizona showing various cholla cacti and ocotillo
on Ajo Mountain drive, Organpipe Cactus National Park the Organpipe cactus extends into USA only in this part of Arizona	the view from Alamo canyon camp, Organpipe cactus N. P. this clearly contrasts the form of the saguaro and organpipe cacti