Rocky Mountain Floristic Region

[1] The region extends from Kodiak Island in Alaska to the San Francisco Bay Area and Sierra Nevada in California.

The region spans from Kodiak Island of Alaska approximately to the San Francisco Bay Area and Sierra Nevada of California, running between the shore of the Pacific Ocean on the west and the Great Plains on the east, along the Rocky Mountains and Pacific Coast Ranges.

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.

Due to more heavy glaciation during the Pleistocene, its flora, especially in the north, has a far lower degree of endemism than that of the Vancouverian Province.