File:Bulletin (Pennsylvania Department of Forestry), no. 11 (1901) (20313849228).jpg

Title: Bulletin (Pennsylvania Department of Forestry), no. 11
Identifier: bulletinpennsylv11penx (find matches)
Year: 1901 (1900s)
Authors: Pennsylvania. Dept. of Forestry
Subjects: Forests and forestry
Publisher: Harrisburg, Pa. : The Department : WM. Stanley Ray, state printer of Pennsylvania
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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SILVER MAPLE. Acer saccharinum, Linnaeus. ff^^^^~^'^f"^ .^ */ A^*")'* ^^"°^ "• ^" ^'-^^^ *^"* °^«y ^^^tai° a maximum height of 120 ftZ L^\T .. ** '^***u '^'""'^ "^^'^ '^"'^ '^^^*^^« ^'^t*' »at"al 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 ycung trunks smooth and gray; on old trunks brown with a some what furrowed 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 chestnut-brown, covered with numerous light lenticelJ^. BUDS—Opposite, red, obtuse-pointed, sessile or short-stalked; flower buds stout spherical accessory, covered with overlapping scales. 0 8 of which maj be exposed. Margin of scales ciliated and often light in color. LEAVES—Opposite, simple. 5-lobed, coarsoly toothed; bright green on upper surface and silVery-white on lower; with deep round-based sinuses. LEAF-SCABS—Opposite, U-shaped to V-shaped, not encircling stem. Bundle-scars 3 in a lunate line. ' FLOWEBS—Appear in March or April before the leaves are out, in dense, sessile, axillary clusters. S-'taminate and pistillate occur in separate clusters souietlmes on tlio same, f:oiue- tiraes on diflferent trees. Petals absent. FBX7IT—Matures about May; clustered along branchlets, borne on slender drooping stalks; wings of the keys usually from 1-2 inches km?, divergent, sometimes straight, or curved. WOOD—Diffuse-porous; moderately hard, rather brittle, close-grained, with wide sapwood. Used for flooring, cheap furniture, and paper pnlp. Weighs 32.84 lbs. per cubic foot. DISTrNGUISHING CHABACTEBISTICS—The Silver Maple, also known as White Maple, River Maple, and Soft Maple, can be recognized in summer by its leaves with a silvery-white lower surface and deep round-based sinuses. In winter it closely resembles the Red Maple but may be distinguished from it by the pun?ont 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 are loose at both ends and fastened in the middle. The lateral branches have a pronounced droop and a distinct upward curve 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 numerous, round, red, collateral buds. BANGE—New Brunswick to southern Ontario, south to Florida and Indian Territory. DISTBIBTJTION 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 cot attain a large size. IMFOBTANCE OF THE SFICIES—The Silver Maple is a very attractive ornamental tree. A few special ornamental varieties have been d.;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 excellent soil covor in the imder-story of the forest. PLATE CVIL SILVER MAPLE. 1. Flowering branch, x h. 2. Branch with mature leaves and mature fruit. z i. 3. A wing of a maple key with exposed seed. X i. 4. A seed, enlarged. 5. End view of a seed, enlarged. 6. A winter twig showing buds, lenticels, leiit- scars. bud-scale sears and bundle-scars. > J-

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