NORTH AMERICAN MAPLES. 93 



Utilizing such differences as I find, I separate the maples 

 of the saccharum group as follows, admitting under each 

 only such citations as I am reasonably sure of, and without 

 having attempted to make the bibliography at all complete. 

 Specimens without mature foliage have not been cited, for 



the reasons above given. 



Acer saccharum Marshall, Arbustrum (1785), 4; New- 

 hall, Trees N. E. Amer. 150, f. 75. — A. saccha- 

 rinum Wangenheim, Nordamer. Holzarten (1787), 26> 

 pi. 11, f. 26; Michaux, Sylva, i. 101, pi. 42; Pursh, 

 Fl. i. 266; Hooker, Fl. Bor.-Amer. i. 113; Torrey, 



Compend 



Torrey & Gray, 



Fl. i. 248; Gray, Manual, ed. 1, 80, ed. 6, 117, and 



School 



Emer 



son Mass. ed. 2, 558, with plate; Bailey, Popular 

 Gardening, 1887, 24, in part, with figure ; and Bot. 

 Gazette, xiii. 214, in part. — A. barbatum Sargent, 

 Silva, ii. 97, pi. 90. — A. palmifolium var.pseudoplata- 

 noides Schwerin, Gartenflora, xlii. 455, f. 95, no. 1. 

 A. saccharinum var. pseudoplatanoides Pax, Engler's 

 Jahrb. vii. 242, in part; Wesmael, Acer, 61. 

 Bark gray; internodes mostly slender and elongated, 

 commonly glossy and reddish ; buds gray, conical, slender 



and acute ; 

 mature bu 



above, the 



tie dilated at base, not concealing the 

 stipules ; leaves thin, typically large 

 broad), flat, dull, usually light green 

 face grayish, glabrous to pubescent, 



or exceptionally quite hirsute when young, isodiametr 



truncate 



broadly cuneate, rather deeply 5-lobed, except for some 

 smaller 3-lobed leaves near the ends of the branches, with 

 typically narrow sinuses, the three larger lobes with parallel 

 sides or dilated upwardly and each with a slender apical 

 acumination often sinuously bidentate on the sides, and 

 two similar lateral acuminations, or the lateral lobes merely 

 sinuate on the upper margin , the smaller outermost lobes 

 mostly sinuously 1 to 2 toothed on the lower margin; 



6 



