Mountainside is a borough in Union County, New Jersey, United States.As of the 2010 United States Census, the boroughs population was 6,685, reflecting an increase of 83 (+1.3%) from the 6,602 counted in the 2000 Census, which had in turn declined by 55 (0.8%) from the 6,657 counted in the 1990 Census.. Mountainside was incorporated as a borough on September 25, 1895, from portions of ...Individual clonal stands can be seen during the autumn, as on this mountainside in the Matanuska Valley in Alaska. P. tremuloides leaves on mature trees are nearly round, 4–8 centimetres (1.6–3.1 in) in diameter with small rounded teeth, and a 3–7 centimetres (1.2–2.8 in) long, flattened petiole.
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