398 



ACERACEAE. 



[VOL. II. 



Acer Drummondii H. & A. Drummond's Maple. (Fig. 2374.) 



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 

 touientum persisting, at least along the veins, 

 the lobes shorter, broader, acute or acuminate; 

 young twigs and petioles more or less tomen- 

 tose; flowers in lateral sessile fascicles unfold- 

 ing much before the leaves; petals present; 

 fruiting pedicels \'-i f long; samaras glabrous, 

 more or less incurved, i l / f -i l /2 f long, the wing 

 5"-io // broad at middle. 



In swamps, southern Missouri to Georgia, Florida 

 and Texas. Fruit brilliant scarlet, ripening in 

 March or April. 



4. Acer Saccharum Marsh. Sugar or Rock Maple. Sugar-tree. (Fig. 2375.) 



Acer Saccharum Marsh. Arb. Amer. 4. 1785. 



Acer saccharinum Wang. Amer. 36. pi. .?./. 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-i20 and trunk diameter of 2#- 

 3#. 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, greenish yellow, drooping on capillary 

 hairy pedicels, appearing with the leaves; petals 

 none; samaras glabrous, slightly diverging, \'-\ l ' 

 long, the wing 3"-s" wide. 



In rich woods, Newfoundland to Manitoba, south, 

 especially along the mountains, to Florida, Nebraska 

 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. April-May. 



5. Acer nigrum Michx. Black Sugar Maple. 

 (Fig. 2376.) 



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

 Acer saccharinum var nigrum T. &. G. Fl. 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. 



Ontario and Vermont to northern Alabama, west to Minne- 

 sota, Louisiana and Arkansas. Wood resembling that of the 

 preceding species, the sapal so yielding much sugar. April- 

 May. 



