ACERACEAE. 



VOL. II. 



5. Acer Drummondii H. & A. Drum- 

 mond's or Hard Maple. Fig-. 2808. 



Acer Drummondii H. & A. ; Hook. Journ. Bot. i : 200. 



1834. 

 Acer rubrum var. Drummondii Sarg. loth Census 



U. S. 9 : 50. 1884. 



A large tree, similar to the preceding species. 

 Leaves 3-6' long, thicker, 3-lobed, or sometimes 

 5-lobed, obtuse or cordate at the base, densely 

 whitish tomentose beneath when' young, the 

 tomentum persisting, at least along the veins, the 

 lobes short, broad, acute or acuminate ; young 

 twigs and petioles more or less tomentose; flow- 

 ers in lateral sessile fascicles unfolding much 

 before the leaves; petals present; fruiting pedi- 

 cels i '-2' long; samaras glabrous, more or less 

 incurved, i-2Y long, the wing s"-io" broad at 

 middle. 



In swamps, southern Missouri to Georgia, Florida 

 and Texas. Fruit brilliant scarlet, ripening in 

 March or April. 



6. Acer saccharum Marsh. Sugar or Rock 

 Maple. Sugar-tree. Fig. 2809. 



Acer saccharum Marsh. Arb. Amer. 4. 1785. 



Acer saccharinum Wang. Amer. 36. pi. 2. f. 26. 1787. 



Not L. 1753. 

 Acer barbatum Michx. Fl. Bor. Am. 2: 252. 1803. 



A large and very valuable tree, with maximum 

 height of ioo-i2O and trunk diameter of 2$-3J. 

 Leaves 3'-6' long, dark green above, pale beneath, 

 cordate or truncate at the base, 3~7-lobed, the lobes 

 acuminate, irregularly sinuate, the sinuses rounded; 

 flowers in sessile, lateral or terminal corymbs, green- 

 ish yellow, drooping on capillary hairy pedicels, 

 appearing with the leaves; petals none; samaras 

 glabrous, slightly diverging,' i'-ij' long, the wing 

 3"-5" wide. 



In rich woods, Newfoundland to Manitoba, south, 

 especially along the mountains, to Florida and Texas. 

 Its sap is the main source of maple sugar. Wood hard, 

 strong, light reddish-brown ; weight per cubic foot 43 Ibs. 

 The bird's-eye and curled maple of cabinet makers are 

 varieties. The tree is widely planted for shade and for 

 ornament. Hard, black or sweet maple. April-May. 



7. Acer nigrum Michx. Black Sugar Maple. 

 Fig. 2810. 



Acer nigrum Michx. f. Hist. Arb. Am. 2 : 238. pi. 16. 1810. 

 Acer saccharinum var. nigrum T. & G. FJ. N. A. i : 248. 1838. 



Acer saccharum var. nigrum Britton, Trans. N. Y. Acad. Sci. 9 : 

 10. 1889. 



A tree, nearly or quite as large as the Sugar Maple, with 

 rough, blackish bark. Leaves similar, but green both 

 sides, thicker and generally more or less pubescent be- 

 neath, especially along the veins ; lobes much broader and 

 shorter, with few undulations or frequently entire, the 

 basal sinus often narrow; samaras slightly more divergent. 



Quebec, Ontario and Vermont to northern Alabama, west to 

 .South Dakota, Louisiana and Arkansas. Wood resembling that 

 of the preceding species, the sap also yielding much sugar. 

 Black or hard maple. April-May. 



