EVSC 380
Coryphantha vivipara
Found mid slope on sandy soils at Carter ranch.
Key identification characteristics is cactus is spherical shape and has a brownish fleshy berry.
Compared to Opuntia polyacantha, pin cushion differs by having a spherical shape and has bright purple flowers.
Used Common Plants of the Western Rangelands (Volume 2)- trees and shrubs to identify.