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Picea engelmannii
''Picea engelmannii'', with common names Engelmann spruce, white spruce,〔 mountain spruce,〔 or silver spruce,〔 is a species of spruce native to western North America, from central British Columbia and southwest Alberta, southwest to northern California and southeast to Arizona and New Mexico; there are also two isolated populations in northern Mexico. It is mostly a high altitude mountain tree, growing at – altitude, rarely lower in the northwest of the range; in many areas it reaches the alpine tree line.
==Description ==
''Picea engelmannii'' is a medium-sized to large evergreen tree growing to – tall, exceptionally to tall, and with a trunk diameter of up to . The bark is thin and scaly, flaking off in small circular plates 5–10 cm across. The crown is narrow conic in young trees, becoming cylindric in older trees. The shoots are buff-brown to orange-brown, usually densely pubescent, and with prominent pulvini. The leaves are needle-like, 15–30 mm 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, 4–8 cm long and 1.5 cm broad when closed, opening to 3 cm broad. They have thin, flexible scales 15–20 mm long, with a wavy margin. They are reddish to dark purple, maturing pale brown 4–7 months after pollination. The seeds are black, 2–3 mm long, with a slender, 5–8 mm 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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