Opuntia echios is a species of plant in the Cactaceae family. It is endemic to theGalápagos Islands (Ecuador) and is commonly known as the Galápagos prickly pear, but there are five other species of prickly pears that also are endemic to the archipelago (O. galapageia, O. helleri, O. insularis, O. megasperma and O. saxicola).
There are five varieties of Opuntia echios, each with a different appearance and distribution: Opuntia echios var. echios on the islands of Santa Cruz, Baltra, Daphne Major and South Plaza, Opuntia echios var.barringtonensis on Santa Fe, Opuntia echiosvar. gigantea near Academy Bay on Santa Cruz, Opuntia echios var. inermis on theSierra Negra Volcano on Isabela andOpuntia echios var. zacana on North Seymour.
(From Wikipedia, July 2015)