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Cactaceae family

Opuntia triacanthos
(Willdenow) Sweet
, Hort. Brit. (ed. 1) 172.  1826 “triacantha.”
Bas.: Cactus triacanthos Willdenow (1814).

West Indian endemic.
Succulent of rocky coastal savanna and cliffs.
Quite common in small areason Moule a Chique summit and Maria Island, Vieux Fort and Mon Repos, Micoud.
Anguilla, St. Martin, St. Barthélemy, Antigua, Saba, St. Eustatius, St. Kitts, Nevis, Redonda, Montserrat, Guadeloupe, La Désirade, Marie Galante, Les Saintes, Martinique, St. Lucia, Puerto Rico, Virgin Islands (St. Croix, St. Thomas).
Dangerous. The spines penetrate the skin easily and detach readily from the plant. They are barbed to make it very difficult and painful to extract.

This species is often incorrectly called Opuntia triacantha (Willdenow) Sweet.
"The basionym epithet "triacanthos" (Greek) is both masculine and feminine. For his new combination, Sweet revised the epithet to "triacantha" (Latin). Such a revision is unwarranted. " source IPNI. GRIN also sticks to Opuntia triacanthos.