142 WOODY PLANTS 



uously striped with white lines; twigs smooth, thick, green, chang- 

 ing to red; lenticels few; buds stalked, about 1 cm. long, tapering 

 but blunt-pointed, red, glossy, glabrous except for the ciliate mar- 

 gins of the scales; leaf-scars broadly U-shaped, almost encircling 

 the twig. Cool woods, Quebec to Manitoba, south to Michigan, Ohio, 

 and the mountains of Tennessee and Georgia (Fig. 195). 



3. A_. platanoides L. Norway Maple . Tree to 30 m. high; bark 

 rough, broken; twigs thick, with milky sap; terminal bud plump, 

 large and conspicuous, usually more than 5 mm. long. Introduced 

 from Europe, much planted and sometimes escaping (Fig. 196). 



4. A. saccharum Marsh. Sugar Maple. Tree to 40 m. high, 

 witli gray, furrowed bark; twigs slender, dull, smooth, reddish- 

 brown to orange -brown; buds brown, conical, sharp-pointed, gla- 

 brous or hairy at the apex, the terminal one 5 mm. or less in length; 

 leaf- scars U-shaped or V-shaped, nearly encircling the stem. 

 Rich woods, Quebec to Manitoba, south to Georgia, Mississippi, 

 Arkansas, and Texas (Fig. 197). 



5. A. nigrum Miclix. f. (A. saccharum var. nigrum (Michx. 

 f. ) Britt. ). Black Sugar Maole^ Black Maple . A tree 40 m. high, 

 with dark gray bark; twigs slender, glossy, buff; lenticels promi- 

 nent; buds dark, hairy; leaf-scars U-shaped or V-shaped. Rich 

 woods, Quebec to Minnesota and South Dakota, south to Georgia and 

 Louisiana (Fig. 198). 



6. _A. rubrum L. Red Maple. Tree up to 40 m. high; bark on 

 young trunks smooth and light gray, on older trunks dark grayish 

 and rough; twigs rather slender, green, becoming glossy red as 

 winter progresses; buds reddish, obtuse, accessory flower buds 

 developing towards spring; flowers red, beginning to bloom in 

 March. Rich soil, Newfoundland to Manitoba, south to Florida and 

 Texas (Fig. 199). 



7. _A. saccharinum L. Silver Maple. A tree up to 40 m. high; 

 bark on young trunks smooth and light gray, on older trunks brown 

 and shallowly fissured; crushed twigs with a rank unpleasant odor; 

 buds reddish, obtuse, sessile or short- stalked; flower buds spheri- 

 cal, accessory; margin of scales ciliate, often lighter in color; 

 flowers greenish-yellow or reddish, beginning to open in February. 

 River-banks and bottomlands. New Brunswick to Minnesota and 

 South Dakota, south to Florida and Arkansas (Fig. 200). 



8. A. negundo L. Box Elder. Tree up to 20 m. high; bark 

 dark gray or brown, divided into broad ridges; twigs moderate, 

 green, smooth, sometimes glaucous, with scattered, ratlier 



