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Picea glauca
''Picea glauca'', the white spruce, is a species of spruce native to the northern temperate and boreal forests in North America, from central Alaska to as far east as the Avalon Peninsula in Newfoundland, and south to northern Montana, Minnesota, Wisconsin, Michigan, northwestern Pennsylvania, upstate New York, Vermont, New Hampshire, and Maine; there is also an isolated population in the Black Hills of South Dakota and Wyoming.〔Farjon, A. (1990). ''Pinaceae. Drawings and Descriptions of the Genera''. Koeltz Scientific Books ISBN 3-87429-298-3.〕〔Rushforth, K. (1987). ''Conifers''. Helm ISBN 0-7470-2801-X.〕〔Gymnosperm Database: (''Picea glauca'' )〕〔Flora of North America: (''Picea glauca'' )〕 It is also known as Canadian spruce, skunk spruce, cat spruce, Black Hills spruce, western white spruce, Alberta white spruce, and Porsild spruce.
== Description ==
The white spruce is a large coniferous evergreen tree which grows normally to tall, but can grow up to tall with a trunk diameter of up to . The bark is thin and scaly, flaking off in small circular plates across. The crown is narrow - conic in young trees, becoming cylindric in older trees. The shoots are pale buff-brown, glabrous (hairless) in the east of the range, but often pubescent in the west, and with prominent pulvini. The leaves are needle-like, long, rhombic in cross-section, glaucous blue-green above with several thin lines of stomata, and blue-white below with two broad bands of stomata.〔〔
The cones are pendulous, slender, cylindrical, long and wide when closed, opening to broad. They have thin, flexible scales long, with a smoothly rounded margin. They are green or reddish, maturing to pale brown 4 to 8 months after pollination. The seeds are black, long, with a slender, long pale 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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