Coin-toss cholla.
This is new growth on either staghorn or buckhorn cholla (Cylindropuntia versicolor or C. acanthocarpa, respectively). Both species occur locally, so I see one or the other frequently, but they look so similar they defy my small
diagnostic skills. Did I mention that they also readily hybridize where their ranges overlap? Of course they do, making it nearly impossible for tyros like me to identify them!
At Pima Wash, South Mountain Preserve, in Phoenix, Arizona.



