...A deciduous tall tree of the birch family that grows in moist soil (illustration). In many areas, it is planted on the ridges of rice fields and used as a rice plant. The trunk is upright and can reach 15 meters, with finely divided bark. The leaves are ovate-oblong with low serrations, wedge-shaped at the base, and have 1-3 cm long petioles. The winter buds are stalked, ovate, and surrounded by the blade and stipules of the first leaf. The male inflorescences form at the tips of the branches in summer. The bracts and bracteoles contain three flowers, each consisting of four pistils surrounded by a four-lobed perianth. The male inflorescences elongate in winter, droop, and bloom, scattering pollen. ... *Some of the terminology that mentions "Alnus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…湿った土地に生えるカバノキ科の落葉高木(イラスト)。田のあぜなどに植え,これを稲木とする地方も多い。幹は直立し,15mにも達し,樹皮は細かく割れる。葉は卵状長楕円形で,低い鋸歯があり,基部はくさび形で,長さ1~3cmの葉柄がある。冬芽は柄があり,卵形で,最初の葉の葉身と托葉とに包まれている。雄花序は夏に枝の先端に形成される。苞と小苞の内に3花があり,4裂する花被に包まれた4本のめしべからなる。雄花序は冬に伸長し,下垂して開花し,花粉を散らす。… ※「Alnus」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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