A large perennial grass (illustration) that grows in clusters on the edges of ponds and rivers. It has a thick, horizontal underground stem and the leaves and stems grow in clusters. The stem is thick, cylindrical, hollow, and 1-3m tall. The leaves are broad, linear, 40-1m long, 2-3cm wide, and the leaf sheaths are somewhat spongy. Large, sparse panicles appear from August to early October. The inflorescence is over 50cm long, and produces numerous spikelets that are somewhat densely arranged on multiple branches. The spikelets are unisexual, and both males and females lack glumes and only have a single floret. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
池沼や河川のへりに群生している大型のイネ科の多年草(イラスト)。太く横にはった地下茎があり,葉と茎を叢生(そうせい)する。茎は太い円柱形で中空,高さは1~3mになる。葉は幅広い線形で,長さは40cmから1mに達し,幅は2~3cm,葉鞘(ようしよう)はややスポンジ質である。8月から10月初めに大型でまばらな円錐花序が出る。花序の長さは50cm余りで,多数の枝を分かって,やや密に無数の小穂をつける。小穂は単性で,雌雄ともに苞穎(ほうえい)がなく,1個の小花のみとなる。
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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