Japan Flora: Glabrous perennial; stems erect, thick, terete, 40-80 cm, long, often branched at base; leaves numerous, rather dense, oblanceolate to linear-oblanceolate, 4-7 cm. long, 8-12 mm. wide, rounded to very obtuse at apex, entire and gradu­ally narrowed toward the base, green, the midrib prominently raised beneath, the verticillate leaves similar, the involucral leaves oblong or elliptic, 1-2 cm. long, 6-12 mm. wide, yellow­ish; glands of involucres transversely flabellate-elliptic, yellow­ish, depressed; capsules densely tuberculate, about 6 mm. across; seeds subglobose, about 3 mm. long, smooth. Apr.-May. Rocky places near seashores.

Honshu (Awa Prov. and weshv.), Shikoku, Kyushu.  s. Korea, Ryukyus, and Formosa.