Japan Flora: Strigose and scabrous erect annual; stems often branched, terete, 20-40 cm. long; leaves opposite, the upper ones alternate, broadly linear to linear-lanceolate, 2-5 cm. long, 3-7 mm. wide, nearly entire, sessile; flowers nearly sessile, yellowish, 15-20 mm. long, the bracteoles narrowly lanceolate, shorter than and ap- pressed to the calyx; calyx shallowly split in front, acute, 7-40 mm. long at anthesis, 10-15 mm. long in fruit, longer than the capsule; seeds truncate at apex, cuneate at base, obliquely lineo­late. Aug.-Oct. Wet grassy places in lowlands.

Honshu, Shikoku, Kyushu. The typical phase occurs in Korea, Ryukyus, Formosa, China, and Indochina.