. Ecologically significant wetlands in the Upper Yellowstone River watershed : including the Boulder, Clarks Fork Yellowstone, Shields, and Stillwater River drainages . Plant communities; Botany; Rare plants; Plant conservation. Current Project Area Watersheds Previously Inventoried Watersheds Planned for Inventory In 2001 Figure 1. Status of Montana Natural Heritage Program wetland inventories. Absaroka and Beartooth Mountains to ! 0 to 20 inclies in the Great Plains (Nesseretal. 1997). Tlie arid Bighorn Basin, which lies in the rain shadow of the Beartooth Mountains, receives only 5 to 12 in
. Ecologically significant wetlands in the Upper Yellowstone River watershed : including the Boulder, Clarks Fork Yellowstone, Shields, and Stillwater River drainages . Plant communities; Botany; Rare plants; Plant conservation. Current Project Area Watersheds Previously Inventoried Watersheds Planned for Inventory In 2001 Figure 1. Status of Montana Natural Heritage Program wetland inventories. Absaroka and Beartooth Mountains to ! 0 to 20 inclies in the Great Plains (Nesseretal. 1997). Tlie arid Bighorn Basin, which lies in the rain shadow of the Beartooth Mountains, receives only 5 to 12 inches of precipitation per year ("Nesseret al. 1997). Elevations in the study area range from over feet in the Beailoolh Mountains to just over 3,000 feet at Billings in the Great Plains. Vegetation The Beartooth Mountains suppoit extensive areas of alpine tundra. The range's high plateaus and many peaks contain the largest extent of alpine tundra in Montana (Lesica 1993). Associated with the splendor of the alpine vegetation is the greatest variety and extent of cryopedogenic features obsen'ed anywhere in Montana, including solifluc- tion terraces, soiled nets and stripes, soited and unsorted polygons, and frost hummocks (Johnson and Billings 1961). The vegetation on the Line Creek Plateau is more similar to the high ranges of Wyoming, Utah, and Colorado than any other mountain range in Montana. Line Creek Plateau is a gently rolling alpine tundra landscape with extensive areas of moist snovvbed vegetation. The plateau contains hundreds of glacial lakes and potholes although wetland features are rare (Lesica 1993). Vegetation of these alpine environments is charac- terized by turf vegetation dominated by Ross' avens (Get/in rossii)^ curly sedge (Carex rupesiris). Bellardi bog sedge (Kobresia myosauroides) and blackroot sedge {Carex elynoidesX cushion plant communities dominated by curly sedge, moss campion {Silene acauHs\ dwaiTclover {Trifolinm nanum). and twinflowe
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