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Opuntia sp.
Cactus growing next to the water
Growing in sandy soil next to a salt river in a remote area
Prickly pear is really hard to ID to species without flowers, may be best to just leave it at the genus level?
I don't think that species occurs here, but it looks similar. http://plants.usda.gov/core/profile?symb...
http://www.discoverlife.org/mp/20q