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''Cornus alternifolia'' is a species of flowering plant in the dogwood family Cornaceae, native to eastern North America, from Newfoundland west to southern Manitoba and Minnesota, and south to northern Florida and Mississippi. It is rare in the southern United States.〔(【引用サイトリンク】 Cornus Alternifolia Range Map )〕 It is commonly known as green osier,〔(【引用サイトリンク】 Cornus alternifolia L. f. )〕 alternate-leaved dogwood, and pagoda dogwood.〔 ==Description== It is a small deciduous tree growing to (rarely ) tall, with a trunk up to in diameter. The branches develop characteristic horizontal layers separated by gaps, with a flat-topped crown. Its leaves are elliptic to ovate and grow to long and broad, arranged alternately on the stems, not in opposite pairs typical of the majority of ''Cornus'' species. The leaves are most often arranged in crowded clusters around the ends of the twigs and appear almost whorled. The upper sides of the leaves are smooth and green, while the undersides are hairy and a bluish color. The bark is colored gray to brown, becoming ridged as it ages. Small cream colored flowers are produced, with four small petals. The flowers are grouped into cymes, with the inflorescences 2-5 across. It bears berries with a blackish blue color. * Bark: Dark reddish brown, with shallow ridges. Branchlets at first pale reddish green, later dark green. * Wood: Reddish brown, sapwood pale; heavy, hard, close-grained. Sp. gr., 0.6696; weight of cu. ft., 41-73 lbs. * Winter buds: Light chestnut brown, acute. Inner scales enlarge with the growing shoot and become half an inch long before they fall. * Leaves: Alternate, rarely opposite, often clustered at the ends of the branch, simple, three to five inches long, two to three wide, oval or ovate, wedge-shaped or rounded at base; margin is wavy toothed, slightly reflexed, apex acuminate. They come out of the bud involute, reddish green above, coated with silvery white tomentum beneath, when full grown are bright green above, pale, downy, almost white beneath. Feather-veined, midrib broad, yellowish, prominent beneath, with about six pairs of primary veins. In autumn they turn yellow, or yellow and scarlet. Petioles slender, grooved, hairy, with clasping bases. * Flowers: April, May. Perfect, cream color, borne in many-flowered, broad, open cymes, at the end of short lateral branches. * Calyx: The cup-shaped flowers have four petals that are valvate in bud, unwrapping when in bloom with cream colored, oblong shaped petals with rounded ends. The petals are inserted on disk and the stamens are inserted too and arranged alternately to the petals, being four in number also. The stamens are exserted with filaments long and slender. Anthers oblong, introrse, versatile, two-celled; cells opening longitudinally. * Pistil: Ovary inferior, two-celled; style columnar; stigma capitate. * Fruit: Drupe, globular, blue-black, across, tipped with remnant of style which rises from a slight depression; nut obovoid, many-grooved. October. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cornus alternifolia」の詳細全文を読む スポンサード リンク
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