Japan Flora: Perennial, 25-40 cm. high, the stems, inflorescence, petioles, and underside of leaves recurved- puberulent; leaves thin, narrowly to broadly ovate, 4-8(-10) cm. long, 2-4 cm. wide, very acute, usually broadly cuneate at base, irregularly toothed, sometimes thinly puberulent above, the petioles 1.5-3 cm. long; spikes 3-5 cm. long, one-sided, the bracts broadly lanceolate, nearly as long as the calyx; flow­ers 8*10 mm. long, short-pedicellate; calyx broadly ovoid in fruit, 3-3.5 mm. across, uniformly glandular-puberulent, the upper calyx teeth deltoid, obtuse, the lower 2 narrowly deltoid, acute; nutlets nearly orbicular, inflated-lenticular, 1.2 mm. in diameter, the scar orbicular. July-Sept. Wet places in lowlands and hills;

Honshu, Shikoku, Kyushu. Ryukyus and Formosa, and Malaysia to India.