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Opuntia sp
Currently, only prickly pears are included in this genus of about 200[1] species distributed throughout most of the Americas. Chollas are now separated into the genus Cylindropuntia, which some still consider a subgenus of Opuntia. Austrocylindropuntia, Corynopuntia and Micropuntia are also often included in the present genus, but like Cylindropuntia they seem rather well distinct. Brasiliopuntia and Miqueliopuntia are closer relatives of Opuntia. The most commonly culinary species is the Indian Fig Opuntia (O. ficus-indica). Most culinary uses of the term "prickly pear" refer to this species. Prickly pears are also known as "tuna", "nopal" or nopales, from the Nahuatl word nōpalli for the pads, or nostle, from the Nahuatl word nōchtli for the fruit; or paddle cactus. This and similar species are native to Mexico. The genus is named for the Ancient Greek city of Opus.
close to Opuntia monacantha or Opuntia humifusa kind of Prickly Pear or Indian Fig not sure which one,
I found that http://commons.wikimedia.org/wiki/File:C... Maybe this can help you.
Great spotting ! :)