Opuntia keeps in livestock and marks the boundaries of family lands. They are resilient and often grow back following removal. The cactus lends its name to a song by British jazz/classical group Portico Quartet. The song "My Rival", on the album "Gaucho" by the American jazz-pop group Steely Dan begins with the words, "The wind was driving in my face/The smell of prickly pear." In the fall of 1961, Cuba had its troops plant an barrier of "Opuntia" cactus along the northeastern section of the fence surrounding the Guantanamo Bay Naval Base to stop Cubans from escaping Cuba to take refuge
Opuntia readily between species. This can make classification difficult, yielding a reticulate phylogeny where different species come together in hybridization. Also, not all species listed here may actually belong in this genus, meaning that "Opuntia" is not a monophyletic group. "Opuntia" also has a tendency for polyploidy. The ancestral diploid state was 2n=22, but many species are hexaploid (6n = 66) or octaploid (8n = 88). Chollas, now recognized to belong to the distinct genus "Cylindropuntia", are distinguished by having cylindrical, rather than flattened, stem segments with large barbed spines. The stem joints of several species, notably the jumping cholla ("Cylindropuntia