alpine altitude America baker flora flower high lupine mimulus montane mountain natural nature scree slope usa wild canada Coast Mountains conifer lake landscape meadow sub-alpine tree Whistler colorado crassulaceae green pink Queen's Crown Rhodiola rhodantha Rocky Mountains cold fierce icy meltwater pour rivulet rock.boulder stream water Alchemilla alpina Alpine lady's mantle flowers herb leaf leaves norway norwegian plant rock autumn color colour foliage patchwork Rockies conifers forest pool trees