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Picea sitchensis
''Picea sitchensis'', the Sitka spruce, is a large coniferous evergreen tree growing to almost 100 m (330 ft) tall, and with a trunk diameter at breast height that can exceed 5 m (16 ft) (see List of superlative trees). It is by far the largest species of spruce and the fifth largest conifer in the world (behind giant sequoia, coast redwood, kauri and western redcedar);〔(【引用サイトリンク】title=Agathis australis )〕 and the third tallest conifer species (after coast redwood and coast Douglas-fir). The Sitka spruce is one of the few species documented to reach 91 metres (299 ft) feet in height.〔(【引用サイトリンク】title=Tallest Sitka Spruce )〕 It acquires its name from the community of Sitka, Alaska.
==Description==
The bark is thin and scaly, flaking off in small circular plates across. The crown is broad conic in young trees, becoming cylindric in older trees; old trees may not have branches lower than . The shoots are very pale buff-brown, almost white, and glabrous (hairless) but with prominent pulvini. The leaves are stiff, sharp and needle-like, 15–25 mm long, flattened in cross-section, dark glaucous blue-green above with two or three thin lines of stomata, and blue-white below with two dense bands of stomata.
The cones are pendulous, slender cylindrical, long 〔(【引用サイトリンク】title=Picea sitchensis )〕 and 2 cm broad when closed, opening to 3 cm broad. They have thin, flexible scales 15–20 mm long; the bracts just above the scales are the longest of any spruce, occasionally just exserted and visible on the closed cones. They are green or reddish, maturing pale brown 5–7 months after pollination. The seeds are black, 3 mm long, with a slender, 7–9 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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