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Prickly pear is a common name being used for many cactus of Opuncia family. Above one is Wheel Cactus(Opuncia Robusta) or Nopal which is Endemic to Mexico and North America. So, might have been found in Texas which is in the border of US, Mexico
Looks like a prickly pear to me, but get someone to confirm it.
Spotted on Apr 28, 2012 Submitted on Apr 28, 2012