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"Kariyasu" (Miscanthus tinctorius) belongs to Poaceae (the Grass family). It is a perennial herb that is distributed from the northern Kinki region north to the southern Tohoku region of Honshu, Japan. It grows in sunny grassland in mountainous to subalpine zones and grows 60 to 100 cm tall. It grows bushy, and its leaves are narrowly lanceolate to broadly linear. From August to October, it produces an erect inflorescence at the top of the stem, which bears 3 to 10 spikes. The base of the spikelet is characterized by short hairs and the absence of awn. It has been used as a dye since ancient times and was commonly used to dye common people's clothes in the Tenpyo period (710-794).
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