Chikusichloa aquafica Koidz.

Japanese: ツクシガヤ（英語表記）Chikusichloa aquafica Koidz.

It is a perennial grass of the Poaceae family that grows in wetlands and marshes, and is one of the rare species known only from a few places in Japan and China. It is a rather large herbaceous plant, with stems rising from short rhizomes and reaching a height of 1-1.2m. The leaves are long and linear, 40-70cm long and about 10mm wide, rough overall, gradually becoming longer and more pointed at the tips, and thin but hard. From August to October, it produces a large, somewhat sparse panicle at the top of the stem, about 50cm long and 20cm wide. The branches are thin and open obliquely when flowering, but later stand up along the central axis and produce a few spikelets.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

水湿地に生えるイネ科の多年草で，日本と中国の数ヵ所のみに知られた稀品の一つである。やや大型の草本で，茎は短い根茎から立ち上がり，高さは1～1.2m。葉は長い線形で，長さ40～70cm，幅は10mm内外あり，全体にざらつき，先はしだいに長くとがり，質は薄いが硬い。8～10月ころ，茎の頂に長さ50cm，幅20cmくらいのややまばらで大型の円錐花序を出す。枝は細く，開花時には斜開するが，後に中軸に沿って立ち，少数個の小穂をつける。

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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