This cactus is round and resembles a spherical watermelon. It has spikes around it and they grow in clumps.
Blooming barrel cactus on rocky south facing hill.
Young barrel cactus near Boyd Deep Canyon Campground
Ferocactus cylindraceus is a species of barrel cactus which is known by several common names, including California barrel cactus, Desert barrel cactus, and miner's compass. It was first described by George Engelmann in 1853.