. Brigham Young University science bulletin. Biology -- Periodicals. 20 Brigham Young University Science Bulletin willows and extending into the wet meadows are Andromeda polifola, Cardamine purpurea, PedicuUiris kanei, P. sudetica, P. lahradurica, and Ruhus chamaemorus. The extent of the wet meadow and the willow-birch thicket is con- trolled by the topography features of the lake basin. Also, the height of the willows and birches is apparently a function of topography and snow depth, with the height of the inner ridge of the lake basin and the height of the snow bank fonned adjacent to the r
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. Brigham Young University science bulletin. Biology -- Periodicals. 20 Brigham Young University Science Bulletin willows and extending into the wet meadows are Andromeda polifola, Cardamine purpurea, PedicuUiris kanei, P. sudetica, P. lahradurica, and Ruhus chamaemorus. The extent of the wet meadow and the willow-birch thicket is con- trolled by the topography features of the lake basin. Also, the height of the willows and birches is apparently a function of topography and snow depth, with the height of the inner ridge of the lake basin and the height of the snow bank fonned adjacent to the ridge limiting shrub height. Ledtnn decumhcivi and Empetrum nig- rum fill in between the willows and the birches. In some lakes there is an accumulation of several feet of organic debris along the beaches. The aquatic and seniiacjuatic plants (X'cupy the or- ganic fill in the same se(juence as in lakes which have rocky basins forming the beach. The shal- low lake at collecting locality 72 has two organic debris littered beaches (Fig. 20). Tussock Tundra Landward from either lakes or streams, there is developed a hummocky tundra which covers more land surface than any other vegetative type. Even here there is much variation in the com- position of the vegetation. Near streams and lakes there is a transition from the tallish, lush vegetation characterizing these sites to the hum- mocky tundra type (Fig. 21 and 22). Slopes along streams are characteristically transitional to tussock tundra also (Fig. 23). The transition may be completely subtle or it may be abrupt. Generally, Salix alaxensus gives way abruptly along the wet sites, but the other species of wil- low which may grow to a height of a few feet along the streams continue to dominate the rounded hummocks of the tundra, but seldom reach a height much above the hummocks. They grow there with Vaccinium vitk-klaea, V. uligin- ostim, Betula glanduJosa, Drija.s integrifoJia, Ar- ctostaphtflos alpirui, Pedicularis capitata, P. la