Bokes Button Cactus

Probably Boke's, but I'll go back and photograph some of the Common Button cacti (easy to confuse with Boke's) found nearby. This one is 3-4 cm tall. When the rains come, this plant will fill up with water and become much more spherical. If weather continues to be dry, it will continue to shrink until it is little more than a flat pancake.

Done