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Excerpt from Botanical Observations in Western Wyoming: With Notices of Rare Plants and Descriptions of New Species Collected on the Route of the North-Western Wyoming Expedition, Under Captain W. A. Jones, U. S. Engineer Corps, Department of the Platte
Oh reaching the higher ground forming the eastern rim of the Green River basin, which leads by an easy pass, at an average ele vation of seven thousand feet above the sea level, from the Pacific to the Atlantic slope, the prevalent desert growth gives place to a vegetation partaking of a sub-alpine character. This district comprises the botanical localities designated by Nuttall as dry and lofty hills in the central range of the Rocky Mountains.
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