tUGHT species and two varieties of poplar (Populus) are native to Canada and are commonly known as Aspens, Cottonwoods and Balsam Poplars (Plates I and II). They are usually tall, rapid-growing, short-lived trees, possessing an abundance of attractive foliage. A unique character of the Aspens and Cottonwoods is that the leaf-stalks (petioles) are flattened at right angles to the blades and this causes the leaves to tremble and rustle even in the slightest breeze. Poplar leaves, in their autumn

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... olors, display the brightest yellow hues of our landscape.