hornbeam

...A deciduous tall tree of the birch family that grows in mountainous areas. The bark is thin and hairy at first, but later becomes glabrous. The leaves are alternate, ovate-oblong, slightly cordate or rounded at the base, and duplicato-serrated at the edge. The lateral veins are obvious, run parallel, and contain up to 20 veins. The plant is monoecious, but produces separate catkins. The male inflorescences appear in the axils of the previous year's branches, and when the new shoots emerge, they hang down like long tails and scatter pollen. The female inflorescences are borne at the tips of the new branches. Two flowers are borne in the axils of the scale-like bracts, and each flower has a bracteolet at its base. ...

*Some of the terminology that mentions "hornbeam" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…山地に生えるカバノキ科の落葉高木で，樹皮は縦に細かくはげる（イラスト）。枝は細く，初めは長毛があるが，後に無毛となる。葉は互生で，卵状長楕円形，基部はやや心形または円形で，縁には重鋸歯がある。側脈は明らかで，平行して走り，20脈以上がある。雌雄同株だが，別々の尾状花序を出す。雄花序は前年枝の葉腋（ようえき）に出て，新芽の開出時に，長く尾状に垂れ下がり，花粉を散らす。雌花序は新枝の先端につく。鱗片状の苞の腋に2花があり，それぞれの花の基部には小苞がある。…

※「hornbeam」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