Tree Species Differences
In Eastern North America leaves turn a wide variety of
colors in the fall. However, in the west they only turn
yellow/brown. Why do we get reds and ranges of Orange in southern
Ontario and only brown in Alberta?
Leaf color is often characteristic of the tree species (kind of tree)
as well as environmental variables.
Anthony R. Brach, PhD
Missouri Botanical Garden
Harvard University Herbaria
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Update: June 2012