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Tsuga mertensiana
''Tsuga mertensiana'', known as mountain hemlock, is a species of hemlock native to the west coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Tulare County, California.〔(【引用サイトリンク】url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233501323 )〕〔(【引用サイトリンク】url=http://www.conifers.org/pi/Tsuga_mertensiana.php )〕 ''Mertensiana'' refers to Franz Carl Mertens (1764–1831), a German botanist.〔David Gledhill in ''The Names of Plants'' (3rd edition), Cambridge University Press, 2002.〕
==Description==
''Tsuga mertensiana'' is a large evergreen coniferous tree growing to tall, with exceptional specimens as tall as tall. They have a trunk diameter of up to . The bark is thin and square-cracked or furrowed, and gray in color. The crown is a neat, slender, conic shape in young trees with a tilted or drooping lead shoot, becoming cylindric in older trees. At all ages, it is distinguished by the slightly pendulous branchlet tips. The shoots are orange–brown, with dense pubescence about long. The leaves are needle-like, long and broad, soft, blunt-tipped, only slightly flattened in cross-section, pale glaucous blue-green above, and with two broad bands of bluish-white stomata below with only a narrow green midrib between the bands; they differ from those of any other species of hemlock in also having stomata on the upper surface, and are arranged spirally all around the shoot.
The cones are small (but much longer than those of any other species of hemlock), pendulous, cylindrical, long and broad when closed, opening to broad, superficially somewhat like a small spruce cone. They have thin, flexible scales long. The immature cones are dark purple (rarely green), maturing red–brown 5 to 7 months after pollination. The seeds are red–brown, long, with a slender, -long pale pink–brown wing.〔〔〔
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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