Proceedin,^s of the Ohio State Academy of Science 167 



nate, coarsely and irregularly dentate, truncate or slightly cor- 

 date at the base, green above, silvery white and more or less pu- 

 bescent beneath. A fine shade tree and much planted. Wood 

 soft and white ; used for furniture. Yields a small amount of 

 sugar. Along streams. N. B. to Fla., Ont., N. Dak., Neb., Okl., 

 and Ohio. 



2. Acer rubrum L. Red Maple. A tree with flaky or 

 smoothish bark and reddish twigs. Leaves sharply 3-5-lobed, 

 the lobes irregularly dentate, acute or acuminate, cordate at the 

 base, green above, whitish beneath. Wood of considerable value 

 when it shows a "curly grain." Leaves crimson, scarlet or yel- 

 low in autumn. Self-pruning like the preceding. Li swamps 

 and low ground, also on moist hillsides. N. B. to Man., Fla., 

 Tex., and Ohio. 



3. Acer saccharum Marsh. Sugar Maple. A large tree 

 with yellow or sometimes red leaves in autumn. Leaves cordate 

 or truncate at the base, 3-7-lobed, the lobes acuminate, irregularly 

 sinuate, dark green above, pale and nearly glabrous beneath. Its 

 sap is the main source of maple sugar and syrup. An average 

 tree will yield 2-10 lbs. of sugar a season. A fine shade tree. 

 The ashes give large quantities of potash. Wood heavy, hard, 

 strong and tough ; used for fuel, interior finish, furniture, keels 

 of boats and ships, implements and machinery, sucker rods, shoe 

 pegs, piano action, school apparatus, large wood type, tool and 

 broom handles, and wood carving. Xewf. to Man., south to Fla. 

 Tex., and Ohio. 



4. Acer nigrum Mx. Black Maple. A large fine tree 

 with rough blackish bark. Leaves cordate or truncate at the 

 base, 3-7-lobed, the lobes bread and short, green on both sides, 

 generally more or less pubescent beneath. It is equally valuable 

 for the making of sugar. Wood much the same as in the Sugar 

 Maple, and used for the same purposes. Ont. and Vt. to Ga., 

 Minn., La., Ark., and Ohio. 



5. Acer pennsylvanicum L. Striped Maple. A small 

 tree with smoothish green bark striped with darker lines. Leaves 

 broadest above the middle, thin, glabrous above ^slightly pubescent 

 beneath when young, truncate or somewhat cordate at the base. 



