Opuntia triacantha cactus grows on the sandy limestone of exposed reefs. This species is threatened by the cactus moth ("Cactoblastis cactorum"). Opuntia triacantha Opuntia triacantha is a species of cactus known by the common names Spanish lady, Keys Joe-jumper, Big Pine Key prickly-pear, and jumping prickly apple. It is native to the Caribbean, from Desecheo Island, Puerto Rico, to the Lesser Antilles. This cactus grows prostrate or upright to a maximum length of 60 centimeters. The stem segments are flattened and oval in shape, up to 18 centimeters long by 7 wide. The black-tipped spines are up to 4 centimeters long. The
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