Cylindropuntia whipplei ssp. enodis
I was just tipped off to a recent paper noting a subspecies of Cylindropuntia whipplei found in northwest Arizona and southern Nevada, C. whipplei ssp. enodis. Its principal difference (as discernible in photos) is its fruit with absent or much-reduced tubercles. Also, as noted here, the fruit can proliferate (like chain-fruit cholla). A search of iNaturalist observations turned up a number of matching plants, especially around Kingman, AZ.
