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Transition zone covers the river valley at 5600 feet and runs up on S.W. slopes as high as 8000 feet. This is owing to the bare dry exposure which absorbs heat and carries scattered plants very high. On the less barren N.E. slopes transition species reach little above the bottom of the river valley - or not above 6000 feet on steep slopes. The barren nature of the slopes however makes zone lines uncertain and difficult to locate. There is no yellow pine, but Douglas spruce takes its place down to the river banks in spots. Then Ceanothus velutinus, Amelanchier alnifolia, Artemisia tridentata, Bigelovia canesecus & tortifolia, Belsamorrhiza sagittafolia and Wyethia are the principal shrubs.

Along the streams are Populus augustifolia, 3 willows, Almus Betula fontinalis, Crategas and Cornus