A thorny evergreen tree of the family Combriaceae native to the mountains and fields of Japan; large ones can reach a height of 10 m and a diameter of 30 cm. The leaves are alternate, leathery, ovate or elliptical, 4-8 cm long, pointed at the tip, circular or wedge-shaped at the base, sawtoothed at the edge, and have 4-6 pairs of lateral veins. Dioecious, the axillary racemes are 1-2 cm long and produce many small yellow-green flowers in summer. There are 4-6 sepals. There are no petals. The male flowers have many stamens and a disk that exudes nectar. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
日本の山野に自生する有刺のイイギリ科の常緑小高木で,大きなものは高さ10m,直径30cmに達する。葉は互生し,革質で卵形ないし楕円形,長さ4~8cm,先端はとがり,基部は円形または円状くさび形,ふちに鋸歯があり,側脈は4~6対。雌雄異株で,腋生(えきせい)の総状花序は長さ1~2cmで,夏に多数の小さい黄緑色の花をつける。萼(がく)片は4~6個。花弁はない。雄花には多数のおしべがあり,蜜を出す花盤がある。
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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