Also known as castor bean (illustration). A woody herb of the Euphorbiaceae family native to tropical East Africa. The plant is large, with thick, hollow stems, 1-3m tall. In the tropics, it continues to grow perennially, becoming a shrub over 6m tall. In Japan, it dies in winter and is treated as an annual plant. The leaves are palmately lobed, 20-30cm in diameter, serrated, and have long petioles. In Japan, panicles 30-60cm long are produced from the stem apex from summer to autumn, with male flowers with many branched filaments at the base and female flowers at the top. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
トウゴマともいう(イラスト)。熱帯東アフリカ原産のトウダイグサ科の木質草本。草姿は大型で,茎は太く中空,1~3m。熱帯では多年にわたり生長をつづけ,高さ6mをこえる低木状になる。日本では冬に枯れるので一年草として扱われる。葉は掌状に切れ込み,径20~30cm,鋸歯があり,長い葉柄がある。日本では夏から秋に茎頂から長さ30~60cmの円錐花序を出し,基部には多数に分枝した花糸を有する雄花を,また上部には雌花をつける。
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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