Japan Flora: Glabrous annual or biennial; stems often branched from the base, 4-angled; radical leaves small, broadly oblanceo­late to obovate, the cauline leaves oblanceolate, oblong-lanceo­late, or rarely lanceolate, 2-5 cm. long, 3-10 mm. wides obtuse; inflorescence a narrow panicle; flowers white, 5-merous, pedi- celled; calyx-segments lanceolate to broadly so, obtuse, about half as long to as long as the corolla; corolla-lobes 8-12 mm. long, the glandular-grooves in pairs, lanceolate, with long flexuous hairs on margin; capsules slightly longer than the corolla, narrowly ovoid; seeds nearly globose, almost smooth. 

Honshu, Shikoku, Kyushu, Korea and China.