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Betula cordifolia
''Betula cordifolia'' (Mountain Paper Birch, also known as Mountain White Birch or Eastern Paper Birch) is a birch species native to Eastern Canada and the North Eastern United States. Until recently it was considered a variety of ''Betula papyrifera'' (Paper Birch), with which it shares many characteristics, and it was classified as ''B. papyrifera'' var.'' cordifolia'' (Regel) Fern.〔Farrar, J. L. (1995). ''Trees in Canada''. Markham: Fitzhenry and Whiteside Ltd. ISBN 1-55041-199-3〕
==Description==
''Betula cordifolia'' is a deciduous tree that reaches heights of about 25 m and trunk diameters of about 70 cm.〔Powell, G., Beardmore, T. ''New Brunswick Species of Concern: A field guide''. p.17–19. Retrieved from http://www.lib.unb.ca/Texts/Forest/MX212/english/english17.pdf〕 Mature bark is white or bronze-white, peeling in thin layers. The inner surface of the bark is copper coloured and the young bark is shiny brown with pale brown lenticels. The leaves are alternate, ovate, 6–12 cm long, and double-toothed. As the species epithet suggests, the leaf base is generally cordate (heart-shaped), however this can be misleading as it is occasionally flat or rounded. The leaves are dotted with many resin glands and the buds are ovoid and blunt. The twigs are yellow-brown to dark-brown and are dotted with resin glands and gray lenticels.〔 They lack the hairs found on ''Betula papyrifera''.〔Ryan, A. G. (1978). ''Native Tres and Shrubs of Newfoundland and Labrador''. St. John's: Parks Division, Government of Newfoundland and Labrador.〕 The flowers are catkins, with pollen catkins 2–4 cm long and seed catkins 1–2 cm long. The seed catkins mature to about 3–5 cm long and bear winged nutlets about 2–3 mm long.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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