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SILVER MAPLE, 

 Acer saccharinum, Linnaeus. 



FORM— Usually a tree abont 50-60 ft. in h^nght but may attain a maximum height of 120 

 ft. with a diameter of 4i feet. Trunk short and divides into lateral branches which again 

 freely subdivide and form a broad head. Lateral branches have pronounced droop, and 

 distinct upward curve at the end. 



BABK — On branches and young trunks smoorh and gray; on old trunks brown with a some 

 what furrowi'd surface separating into thin flakes which are fastened at the center and loose 

 at both ends. 



TWIGS — Somewhat slender, glossy, at first green, later bright cbestnat-brown, covered 

 with numerous light lenticels. 



BUDS — <»ppop:te, rod, obtuse-pointed, sessilo or short-stalked; flower buds stout, spherical, 

 accessory, covered with overlnpping scales, 3 of which maj be exposed. Margin of scales 

 ciliated and often light in color. 



LEAVES — Opposite, simple, 5-lobed, coarsi-ly toothed; bright green on upper surface and 

 silvery -white on lower; with deep round-bas*?d sinuses. 



LEAF-SCARS — Opposite. U-sheped to V-shaped, not encircling stem. Bundle-scars 3, in a 

 lunate line. 



FLOWERS — Appear In March or April before the leaves are out, In dense, sessile, axillary 

 cluj;t<rs. Stamina tc and pistillate occur in separate clusters sometimes on the same, some- 

 times on different trees. Petab* absent. 



FRUIT — Matures about May; clustered along brancblets, borne on slender drooping stalks; 

 wings of the keys usnally from 1-2 Inches long, divergent, sometimes straight, or curved. 



WOOD — Diffuse porous; moderately hard, rather brittle, close-grained, with wide sapwood. 

 Used for flooring, cheap furniture, and paper pulp. Weighs 32.84 lbs. per cubic foot. 



DISTINGUISHING CHARACTERISTICS — The Silver Maple, also known as White Maple, 

 River Maple, and Soft Maple, can he recognized in summer by its leaves with a silvery-white 

 lower surface and deep rour.d-based sinuses, in winter it closely resembles the Red Maple 

 but may be distinguished from it by the pungent odor of the broken twigs and the bright 

 chestnut-brown twigs. The bark of the Silver Maple is somewhat furrowed and separates into 

 thin flakes which arc loose at both ends and fastened in the middle. The lateral branches have 

 a pronounced droop and a distinct upward eur\ e at the ends. This may sometimes be a dis- 

 tinctive character. The Red Maple and the Silver Maple are distinguished from all the other 

 Maples of the State by the namerons, round, red, collateral buds. 



RANGE — New Brunswick to southern Ontario, south to Florida and Indian Territory. 



DISTRIBUTION IN PENNSYLVANIA— Occasional and local throughout the State, especially 

 along larger streams. 



HABITAT — It prefers a moist deep soil such as is found along stream banks. It will exist 

 in drier locations but not attain a large size. 



IMPORTANCE OF THE SPICIES — The Silver Maple is a very attractive ornamental tree. A 

 few special ornamental varieties have been di?veloped. The wood is brittle and consequently 

 the branches are apt to be broken off during a storm. This defect somewhat checks the 

 planting of this species in exposed places. It is a rapid grower. The wood which it produces 

 Is of no special commercial importance and consequently it has little to recommend it for 

 forestry purposes, except that it forms an excellen't soil cover in the under-story of the forest. 



