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In page Mount McLoughlin:

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About 20 tree species can be found throughout Mount McLoughlin's surroundings, including Pacific yew at low elevations, mountain hemlock, whitebark pine, and subalpine fir at higher elevations, and lodgepole pine and red fir throughout.[1] Other plant species include shrubs, wildflowers, junipers, heather, columbine, kinnikinnick, huckleberry,[1] chinquapins, grouse huckleberry, and bearberry.[2]