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Also signalling support was King Charles, who planted a red maple tree on the grounds of Buckingham Palace and wore his Canadian medals during a high profile visit to a naval warship.

Black walnut trees with bright-yellow leaves shine on this route, as do the colors of the European white birch, Japanese zelkova and red maple.

Among them: red maple, red oak, basswood and ironwood.

There and across the Gulf Coast, red maples have begun to bloom, with helicopter-like fruit decorating their branches with crimson.

Ironically, however, those efforts reinforced the diversity disparity, the researchers found, because many newly planted trees were of a single species: red maple.