Genus Harrisia has a native range including parts of northern South America, Mesoamerica, the Caribbean Basin and the USA state of Florida. South American occurrences are chiefly associated with Argentina, Bolivia, Brazil, Paraguay and Uruguay.
- C.Michael Hogan. 2011. Cactus. Topic ed. Arthur Dawson. Ed.-in-chief Cutler J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC http://www.eoearth.org/article/Cactus?topic=49480
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