. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 3. Betula papyrifera Marsh. Paper or Canoe Birch. Fig. 1496. Betula papyrifera Marsh. Arb. Am. 19. 1785. Betula papyracea Ait. Hort. Kew. 3: 337. 1789. Betula papyrifera minor Tuckerm. Am. Journ. Sci. 45 : 31. 1843. A large forest tree with maximum height of about 80° and trunk diameter of 30, or on mountains re- duced to a low shrub; bark, except of the young
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 3. Betula papyrifera Marsh. Paper or Canoe Birch. Fig. 1496. Betula papyrifera Marsh. Arb. Am. 19. 1785. Betula papyracea Ait. Hort. Kew. 3: 337. 1789. Betula papyrifera minor Tuckerm. Am. Journ. Sci. 45 : 31. 1843. A large forest tree with maximum height of about 80° and trunk diameter of 30, or on mountains re- duced to a low shrub; bark, except of the young wood, peeling in thin layers. Leaves ovate, acute or acumi- nate, dentate and denticulate, subcordate, truncate or obtuse at the base, dark green and glabrous above, glandular and pubescent on the veins beneath, slender- petioled, ii'-4i' long, I'-tf wide; petioles i'-ii' long; staminate aments 2'-4' long; pistillate aments cylindric, slender-peduncled, i'-2' long, i'-i' in diameter in fruit; fruiting bracts 2"-3" long, puberulent or ciliate; nut narrower than its wings. Newfoundland to Alaska, Pennsylvania, Michigan, Ne- braska and Washington. Similar to the Old World B. alba L. Wood hard, strong, reddish-brown; weight per cubic foot 37 lbs. The chalky-white outer bark interesting to tourists. Silver-, bolean- or white-birch. Spool-wood. April-May. Betula cordifolia Regel, differs in having distinctly cor- date leaves, but scarcely otherwise. 4. Betula nigra L. River Birch. Red Birch. Fig. 1497. Betula nigra L. Sp. PI. 982. 1753. A slender tree, sometimes 900 high and the trunk 2k° in diameter; bark reddish or greenish-brown, peeling in very thin layers; twigs reddish. Young shoots, petioles and lower surfaces of the leaves to- mentose; leaves rhombic-ovate, apex acute or obtuse, irregularly serrate or somewhat lobed, base cuneate, when mature dark green and glabrous above, pale and glabrous or somewhat tomentose beneath, ii'-3' long; petioles 3"-8" long;
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
