Opuntia macrocentra
This variable species was formerly split into several species, including Opuntia purpurea. On drought-stressed plants, the reason for this latter epithet is clear.
Plant habit at Aden Crater, 23 Feb 2008.
Plant habit on the east end of the Dona Ana Mts., looking east at the San Andres, 2/25/06.
A flower near The Chimneys at Big Bend National Park, 3/23/06.