Japan Flora: Stems erect, 80-150 cm. high, 4-angled, glabrous, nearly simple; leaves nar­rowly deltoid or deltoid-oblong, 5-10 cm. long, 2.5-5 cm. wide, acuminate, truncate to broadly cuneate at tase, the petioles wingless or very slightly winged; cymes few-flowered, forming a spikelike rather dense panicle, 1-2 cm. long inclusive of the peduncle, minutely glandular-pilose, the bracts small; calyx­lobes broadly ovate, subacute or subobtuse; corolla yellow­green, 6-7 mm. long; capsules ovoid, about 5 mm. long, about 3 mm. across; seeds rather small. July-Aug. Grassy places along rivers in lowlands.

Honshu, Kyushu. Korea, Northeastern China, and China.