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Sclerocactus mesae-verde
''Sclerocactus mesae-verde'', Mesa Verde cactus or Mesa Verde fishhook cactus, is a species of cactus in the Sclerocactus genus occurring in habitat at 4000–5000 ft. only in Colorado and New Mexico in the Four Corners region, United States.〔Spackman, S.; Jennings, B.; Coles, J.; Dawson, C.; Minton, M.; Kratz, A.; Spurrier, C.; Skadelandl, T. 1997. Colorado Rare Plant Field Guide. Fort Collins, CO: Prepared for the Bureau of Land Management, the U.S. Forest Service, and the U.S. Fish & Wildlife Service by the Colorado Natural Heritage Program. . accessed 9/19/2010〕〔Benson, L. 1982. The Cacti of the United States and Canada. Stanford, California: Stanford University Press. 1044p.〕 This species was discovered near Cortez and Mesa Verde by Charles H. Boissevain, and is the only known population group in Colorado. ''Sclerocactus mesae-verde'' was formerly classified in the monotypic genus ''Coloradoa''.〔http://www.centerforplantconservation.org/collection/cpc_viewprofile.asp?CPCNum=3884 . accessed 9/19/2010〕
==Distribution==
Along with the one Colorado population (1,000 plants), in New Mexico the ''Sclerocactus mesae-verde'' population groups (4,000-10,000 plants) are in a four desert locations.〔Tepedino, V.J. 2002. Section III. Environmental Monitoring. III.5 The Reproductive Biology of Rare Rangeland Plants and Their Vulnerability to Insecticides. Grasshoppers: Their biology, identification and management, User Handbook.〕 These five major population groups have been registered as threatened, and there are up to a total of 10 population groups left in the wild. Since 1997 federally and 2003 globally ''Sclerocactus mesae-verde'' has been an officially listed threatened species.〔 It is most frequently found growing on the tops of hills or benches and slopes of hills, from gravelly to loamy and pulverulent clay soil.〔
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