Populus Tremula (Aspen, Quaking aspen, Poplar) is a medium-sized deciduous plant growing to 10-25 m tall, with a trunk up to 1 m diameter. The bark is pale greenish-grey and smooth on young trees with dark grey diamond-shaped lenticels, becoming dark grey and fissured on older trees. The leaves on seedlings and fast-growing stems of root sprouts are very different, heart-shaped to nearly triangular, and often much larger, up to 20 cm long. Adult leaves, produced on branches of mature trees, are nearly round, slightly wider than long, 2-8 cm diameter, with a coarsely toothed margin and a laterally flattened petiole 4-8 cm long.
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