Japan Flora: Stems 5-20 cm. long, simple or sparingly branched, densely leafy; leaves linear, flat, gradually nar­rowed to the tip, minutely serrulate; flowers bisexual, solitary, sessile, the cylindrical spathe 15-20 mm. long, sessile; sepals 3,   lanceolate, obtuse, about 3 mm. long; petals linear, twice as long as the sepals; stamens 3; fruit linear-cylindric, 1.5-2 cm. long; seeds lanceolate, smooth, obtuse at both ends, 2 mm. long, 0.5 mm. wide. Aug.-Oct. Common in paddy fields.

Honshu, Shikoku, Kyushu. Korea and Formosa.