10 Canadian Record of Science. 



in the last and without stipules ; leaves firm, of medium 

 size (usually about 4 in. broad), flat, somewhat glossy and 

 of various shades of green above, pale or glaucous and 

 downy to glabrous beneath, mostly broader than long, 

 cordate with shallow open basal sinus to truncate, 3-lobed, 

 with very open round sinuses (the upper margin of the 

 lateral lobes often spreading nearly in a straight line), the 

 lobes sinuously narrowed from the base to a single acum- 

 ination, or the median line sometimes dilated by a pair 

 of blunt shoulders, one or two similar dilations also on 

 the lower margin of each lateral lobe, and exceptionally 

 developed into short complementary lobes ; fruit as in the 

 last. 



This tree ranges in the United States from Connecticut 

 to Missouri and Michigan, and probably grows in many 

 parts of Eastern Canada. Specimens intermediate between 

 this variety and A. saccharum from Belleville, Ont. {John 

 Macoun), and Niagara Falls, Ont. {Jos. Schrenk) have been 

 referred here by Dr. Trelease. These are the only 

 Canadian specimens of this variety in our herbarium. 



Acer saccharum, var. nigrum (Michx. f.), Britton. 



Bark, nearly black ; internodes, stout, sometimes short, 

 dull, buff' ; buds, dark, ovoid, often obtuse ; petioles dilated 

 at base so as, usually, to cover the buds, with adnate 

 triangular or oblong f oliaceous stipules ; leaves soft but of 

 heavy texture, large (usually 5 to 6 in. broad), witli 

 drooping sides, dull and dark green above, clear green and 

 usually persistently downy below, isodiametric, the larger 

 deeply cordate with often closed sinus, 3 to 5-lobed, with 

 shallow broad sinuses from which the lobes are undulately 

 narrowed to an acute or acuminate point, rarely with 

 short lateral acuminations ; fruit, as in the last. 



Kanges in the United States from New York to 

 Missouri and Michigan, but not known certainly to occur 

 in Canada, though frequently reported. 



