Lithops verruculosa [x]
Titanopsis calcarea (by Etwin1)
This is teddy-bear cholla, Cylindropuntia bigelovii. It’s found in parts of Mexico, California, Arizona and Nevada. Its flowers are a yellow-green color, and they were previously grouped in the prickly-pear genus, Opuntia, but have since been placed in their own genus. The spines are called glochids.