I spotted these flowers on a barrel cactus up the slope on the neighbor’s property. I had the wrong shoes on to go up the slope to get a photo, so Bob climbed up and took this photo. I’m not sure of the exact species of this ferocactus, although it might be F. wislizeni. For sure, it sure has pretty flowers. Click on the image to enlarge.
Update: Crotalus told us the variety of this cactus in comments . . .
This is Ferocactus cylindraceus, the California or Compass Barrel.
Thanks, Crotalus!