NORTH AMERICAN MAPLES. 105 



less tinged with orange, glossy, becoming gray, with small 

 pale lenticels; buds conical, acute, gray pubescent. — Nova 

 Scotia to West Virginia, west to Illinois and Canada. 



Var. barbatum (Michx.) Trelease (Thick-leaved Sugar 

 Maple). — Size and habit of the type. Bark mostly dark; 



mo 



more 



black. — Connecticut to Michigan, south to Tennessee and 

 Missouri. 



Var. nigrum (Michx. f.) Britton (Black Maple). — Bark 

 black; twigs gray or green buff, dull; buds ovoid, dark, 

 mostly very obtuse. — Vermont to Virginia, Kentucky, 

 Missouri and Michigan. 



A. Floridanum (Chapman) Pax (Southern Sugar 

 Maple). — Tree of medium size. Bark dark ( ?) ; twigs 

 glabrous, very slender, reddish becoming gray , with numer- 

 ous prominent lenticels, mostly dull; buds globose ovoid, 

 obtuse, brown to nearly black, very small for the group. 

 Georgia to Florida, Louisiana and Arkansas. 



Var. acuminatum Trelease, can not be separated in its 

 winter condition, so far as my material shows, but it is not 

 improbable that a study of trees in the field may reveal 

 good winter characters. 



apart 



Acer Negundo L., now generally kept 



camore 



eral buds have only two outer scales, and the thin margined 

 leaf scars are mostly glandular ciliate and have 3 large 



bundle 



green 



in the western form, and glabrous, except occasionally near 



nodes, or throug 

 18 



