. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 192 STRIPED MAPLE. t Acer pennsylvanicum, Linnaeus. FORM—Usually from 10-25 ft. in height with a diameter of about 6-12 Inches, but may attain a height of 40 feet. Trunk usually short dividing into slender and straight branches which form a deep and broad crown. BARK—Thin, rather smooth, greenish or reddish-brown, conspicuously marked with longi- tudinal white streaks; later becomes rougher, darker, and less streaked. See Fig. 63. TWIGS—Smooth, stout, at first greenish, later red, with very few inconspicuous lentic
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 192 STRIPED MAPLE. t Acer pennsylvanicum, Linnaeus. FORM—Usually from 10-25 ft. in height with a diameter of about 6-12 Inches, but may attain a height of 40 feet. Trunk usually short dividing into slender and straight branches which form a deep and broad crown. BARK—Thin, rather smooth, greenish or reddish-brown, conspicuously marked with longi- tudinal white streaks; later becomes rougher, darker, and less streaked. See Fig. 63. TWIGS—Smooth, stout, at first greenish, later red, with very few inconspicuous lenticels, and brown pith. Season's growth marked by 3 or sometimes 3 dark lines encircling the twic, formed by fallen outer bud scales. White longitudinal streaks appear the second season. BUDS—Opposite, evidently-stalked,' large, about 2/5 of an inch long excluding stalk tapering but blunt-pointed, red, glossy, angular, covered by a single pair of red, smooth, val- vate scales enclosing a few pairs of smaller and lighter scales. Outer scales are smooth on surface with ciliate margins while the inner scales are hairy as shown in opposite plate. Terminal buds are large while lateral buds are smaller and closely appressed. LEAVES—Opposite, simple, goose-foot-like, 3-lobed at apex, finely serrate on margin, rounded at base, rusty-pubescent below. Petioles long, grooved, with enlarged bases. LEAF-SCARS-Opposite. broadly U-shaped, nearly encircle stem; adjacent edg^s form rather blunt teeth which are separated by a ridge. iJundle-scars usually 3. often subdivided into 5-8. FLOWERS-Appear in May or June after the leaves are full grown In drooping terminal racemes. Staminate and pistillate flowers occur on same plant but in different clusters. FRUIT—Matures in September in drooping racemes; wings of the keys, thin, very divergent, about i of an inch long, marked on one side of seed with a depression. WOOD—Diffuse-porous; soft, close-grained, light brown with wide zone of sapw
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