The maples may be told by their leaves of characteristic shape, but chiefly by their two-seeded fruit or "keys," the two wings of which spread differently in different species. The leaves of some species change in autumn from green to red and other brilliant colors. Those of other species change to yellow without trace of red. Sixty to seventy species have been distinguished, nine of which occur in North America. [p042]

FOOTNOTES

[25] See Sycamore, [page 65].

[26] These notes apply to the American product.

[27] Vermont, New York, and Michigan produce the larger portion of the about fifty million pounds of sugar and three million gallons of syrup annually manufactured in the United States. Third Annual Report of the Fisheries, Game, and Forestry Commissioners, New York, 1897, p. 308.

[28] Sargent.

Sugar Maple, Hard Maple. Acer saccharum Marsh. Acer saccharinum Wang.

Nomenclature. (Sudworth.)

Sugar Maple, Hard Maple (local and common names).

Black Maple (Fla., Ky., N. C.).