Rocky Mountain Region
The Rocky Mountain Region is a
floristic regionwithin the Holarctic Kingdomin western North America( Canadaand the United States) delineated by Armen Takhtajanand Robert F. Thorne.
It spans from
Kodiak Islandof Alaskaapproximately to the San Francisco Bay Areaand Sierra Nevada of California, running between the shore of the Pacific Oceanon the west and the Great Plainson the east, along the Rocky Mountainsand Pacific Coast Ranges. It is bordered by the Canadian Province of the Circumboreal Regionin the north, by the North American Prairies Province of the North American Atlantic Regionin the east and by the Californian Province of the Madrean Regionin the south. The borders with the Canadian and Californian Provinces are vague.
Although the Rocky Mountain Region has no endemic
vascular plantfamilies and only one endemic Marchantiophytafamily ( Gyrothyraceae), it has many endemic genera (such as " Sidalcea", " Luetkea", " Whipplea", " Vancouveria", " Lithophragma", " Tellima", " Tolmiea", " Luina") and numerous endemic species. The genera " Arnica", " Castilleja", " Erigeron", and " Lomatium" have their major center of diversity here. The region possesses the greatest diversity of conifers in the New World. The remaining wildland of the province is covered mostly by temperate coniferous forests(such as Northern California coastal forests, Maritime Coast Range Ponderosa Pine forests, Klamath-Siskiyou forests, British Columbia mainland coastal forests, Fraser Plateau and Basin complex, Northern Pacific coastal forests) dominated by " Pinus ponderosa", " Pinus contorta" and " Pseudotsuga menziesii", as well as the alpine tundraabove timberline. The region is subdivided further into the Vancouverian Province and Rocky Mountain Province.
The Vancouverian Province comprises the coastal part of the region for its entire length, including the
Pacific Coast Ranges. Such plant species and genera as " Sequoia sempervirens", " Sequoiadendron giganteum", " Darlingtonia californica", " Vancouveria" and " Whipplea" are endemic to it. The boundary with the Californian Province is not well-defined.
The Rocky Mountain Province includes the Rocky Mountains and associated ranges. Due to more heavy
glaciationduring the Pleistocene, its flora, especially in the north, has a far lower degree of endemism than that of the Vancouverian Province. Much of it is shared with the Canadian Province and the Circumboreal Region in general.
*Thorne, Robert F. [http://hua.huh.harvard.edu/FNA/Volume/V01/Chapter06.shtml Phytogeography of North America North of Mexico] . "
Flora of North America", Vol. 1, Ch. 6.
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