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Natural Floristic Areas of the Western United States

Steven P. McLaughlin
Journal of Biogeography
Vol. 16, No. 3 (May, 1989), pp. 239-248
Published by: Wiley
DOI: 10.2307/2845260
Stable URL: http://www.jstor.org/stable/2845260
Page Count: 10
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Natural Floristic Areas of the Western United States
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Abstract

The distributions of over 5000 species in ninety-six local floras from the western United States were examined using factor analysis. All local floras were located west of the Great Plains from the Rocky Mountains to the Pacific Coast. Results are presented in the form of contour maps of isochores showing the geographic distributions of floristic elements. Twelve floristic elements were identified: Sonoran, Colorado Plateau, Great Basin, Sierra Nevada, Rocky Mountain, Chihuahua, Apachian, Southern Rocky Mountain-Mogollon, Peninsular, California, Vancouverian and Columbia Plateau. The Mojave Desert area is treated as a subdistrict of the Sonoran Desert floristic area.

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