. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. PLATE XLVI. GRAY BIRCH 1. Flowoniiff bniiM-h with iiiiiiiatmo Icavi-s (s) staiiiimite flowers, (p) pistillate flowors, x l. â 2. Branoli witli mature leaves aiitl fniitiug strobiles, x *. :!. A winged seed, «>nlHrued. 4. A strobile seale, «'iilarKed. ."i. A winter bran< h with a jiarlly dt velMjtcd lennhial staniinat*' aineiit, x *. 0. Section <d' a wint<'i- twii;, enlarged. 123 GRAY BIRCH Betula populifolia, Marshall FOBMâA small tree usually occurring In clumps and attaining a height of 20-30 f
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. PLATE XLVI. GRAY BIRCH 1. Flowoniiff bniiM-h with iiiiiiiatmo Icavi-s (s) staiiiimite flowers, (p) pistillate flowors, x l. â 2. Branoli witli mature leaves aiitl fniitiug strobiles, x *. :!. A winged seed, «>nlHrued. 4. A strobile seale, «'iilarKed. ."i. A winter bran< h with a jiarlly dt velMjtcd lennhial staniinat*' aineiit, x *. 0. Section <d' a wint<'i- twii;, enlarged. 123 GRAY BIRCH Betula populifolia, Marshall FOBMâA small tree usually occurring In clumps and attaining a height of 20-30 ft. with a diameter of 9 inches, but may reach a height of 45 ft. and a diameter of 18 inches. Trunlc slender, often inclined, continuous, and covered with ascending lateral branches with drooping ends which form a narrow pyramidal, rather open, and pointed crown. BARKâDull white, close, smooth, not peeling off into thin film-like layers but covered with triangular black spots below the insertion of the lateral branches. On old trunks black and roughened with fissures. Inner bark orange-yellow. See Figs. 85 and 90. TWIGSâSlender, greenish to brown, roughened by warty projections and by raised, pale, and horizontally-elongated lenticels, later smooth and dull white. BUDSâAlternate, 2-ranked, ovate, 1/5 of an inch long, sharp-pointed, divergent, covered with 3-4 visible, smooth, slightly resinous, brown bud-scales with downy margins. LEAVESâAlternate, simple, triangular, ovate, 2}-3 inches long, l}-2 inches wide, wedge- shaped at base, decidedly serrate on margin, with long-toothed apex and long, slender petioles which cause the leaves to quiver when stimulated by a slight breeze only. LEAF-SCABSâSee "Leaf-Scars" under Black Birch, page 124. FLOWERSâ^Appear about April before the leaves. Staminate occur in solitary or occasionally paired aments which are about li-li Inches long and i of an inch wide during the winter, but develop in spring to a length of 2-4
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforests, bookyear1901
