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The Lax flat-sedge (Cyperus flaccidus) belongs to Poaceae (the Grass family). It is an annual herb that is distributed from Honshu to Shikoku and Kyushu in Japan, as well as the Korean Peninsula, north-central China, and northern and eastern Australia. It grows in rice paddies, rice paddies between rice paddies, fallow fields, and riverbeds, and is 10 to 20 cm tall. It produces many branches that bunch together at the base, and the basal leaves are flat, soft, and slightly oblique. The single inflorescence bears 3 to 8 sparse spikelets. The spikelets are 5 to 12 mm long, pale green, elliptic, and very flattened. It is not listed under this scientific name in the Flora of China.
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