Perennial, 30-60cm tall. Wet places, forming colonies, and as a weed of rice fields. Korea, Japan, China, Southeast Asia, Australia. Leaf blades narrowly lanceolate, lengths 4–7, widths 3-7mm, glabrous, scabrid, base rounded, apex acute. Panicle open, ovate in outline, 3–7cm, glandular, many-spiculate, Jun-Aug.
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