Stag Horn Cholla (Opuntia versicolor) or, maybe, Pencil Cholla (Cylindropuntia ramosissima) growing along the Upper Black Top Mesa Pass trail. Also, in foreground Purplehead (AKA Blue Dick) (Dipterostemon capitatus). In the distance Prickly Pear (Optuna) and, far distance, Saguaro Cactus (Carnegiea gigantean). Palamino Mountain and the Peralta Trail on left, Black Top Mesa on right. East Boulder Canyon runs between. The other side of distant Yellow Peak was where, July 2010, four foolhardy Utah treasure hunters lost their lives to summer temperatures exceeding 180 F. Superstition Wilderness, Tonto National Forest, Arizona.