Careful - it's sharp!
Cylindropuntia ramosissima
Diamond Cholla or branched pencil Cholla
Synonym Opuntia ramosissima
en.wikipedia.org/wiki/Cylindropuntia_ramosissima
plants.usda.gov/java/profile?symbol=CYRA9

General Habitat en.wikipedia.org/wiki/Mojave_Desert#Flora
Joshua Tree National Park
jtz 063