A deciduous medium to tall tree in the maple family (APG classification: Sapindaceae). The bark is green with black spots, resembling the skin of a melon (Cucurbita orientalis). The leaves are opposite, with petioles 3-7 cm long and blades 10-15 cm long and 8-12 cm wide, shallowly 3-lobed, with brown soft hairs along the veins on the underside and fine serrated edges. The winter buds have two pairs of scales. Dioecious. The flowers are pale green-yellow small flowers, about 15 of which grow in a raceme that opens in April and May. They have 5 petals, 5 sepals, and 8 stamens. The fruit has two wings and ripens in autumn. The leaves turn red or yellow in autumn. They are widely distributed in the temperate to subtropical mountainous areas of Honshu, Shikoku, and Kyushu. There are more than a dozen closely related species, such as Korean maple and A. capillipes Maxim., from Japan to the Himalayan region, and one species on the east coast of North America. The Korean maple has hairless leaves on the underside and web-like membranes next to the veins, and is distributed in Honshu and Shikoku west of Fukushima Prefecture. [Ken Ogata September 17, 2020] [Reference] |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
カエデ科(APG分類:ムクロジ科)の落葉中高木ないし高木。樹皮が緑色で黒斑(こくはん)があり、ウリ(マクワウリ)の肌に似る。葉は対生し、葉柄は3~7センチメートル、葉身は長さ10~15センチメートル、幅8~12センチメートルで浅く3裂し、裏面の脈のわきに褐色の軟毛があり、縁(へり)に細重鋸歯(きょし)がある。冬芽の鱗片(りんぺん)は2対(つい)。雌雄異株。花は淡緑黄色の小花で、約15個の花が総状花序につき、4~5月に開く。花弁5枚、萼片(がくへん)5枚、雄しべ8本。果実は2翼があり、秋に熟す。秋に紅葉または黄葉する。本州、四国、九州の温帯から暖帯の山地に広く分布する。ウリカエデ、ホソエカエデA. capillipes Maxim.など近縁種が日本からヒマラヤ地方にかけて十数種、北アメリカ東岸地方に1種ある。ホソエカエデは葉の裏面は無毛で葉脈のわきに水かき状の膜があり、福島県以西の本州、四国に分布する。 [緒方 健 2020年9月17日] [参照項目] |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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