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	For 84 days, from late May to early August, the sun doesn't set on the tundra near Barrow, Alaska.

Canadian Tree Guide

	click image to enlarge		Walnut

			black walnutJuglans nigra L.
			Black walnut is a medium-sized (>35 m) tree. Its exquisitely coloured wood is prized. The roots of black walnut release juglone - a toxin - which inhibits most plants from growing in its understory.
			butternutJuglans cinerea L.
			Butternut is a medium-sized (>22 m) tree. In many areas it is stricken with a fungal disease known as butternut canker. Seeds of this tree are edible. Commercial oil is extracted from the nutmeat, and yellow and orange dyes are produced from the fruit husks and bark of the tree. The nut is an important food source for squirrels and other small mammals.

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