Populus spp.; aspen [Salicaceae]  Relatively short-lived, fast growing, medium-sized deciduous trees with broad, almost round leaves with uniform teeth.  Two species are widespread in Wisconsin:  P. tremuloides (quaking aspen) and P. grandidentata (big-tooth aspen).  Both have flattened petioles, and the trembling leaves that give the former species its name.  Big-tooth aspen  has more coarsely toothed leaves, and is a somewhat more valuable timber tree.  Both are quick invaders of open ground, and both are very good pulpwood species.  [057]

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