The pricklypear genus of cacti is undergoing taxonomic revisions.
Opuntia mesacantha Pricklypear entire
After a period of many of the pricklypear species all being classified as Opuntia humifusa, they are getting new designations.
For a current key to the species, go to Opuntia genus page at the Atlas of Florida Plants and scroll down to the Identification Key.
Species of the Opuntia genus in the Wild Florida Photo database: