Japan Flora: Rhizomes short, forming a large clump; basal sheaths dark brown, lustrous; leaves very stiff, deep green, conduplicate; spikes numerous, androgynous, oblong-cylindric, 5-20 mm. long, 3.5-4 mm. thick, unbranched or with branching peduncles solitary to binate on each node, the bracts (at least the lower ones) elongate, leaflike, over-topping the inflorescence; perigynia broadly elliptic, prominently nerved. Aug.-Nov. Open woods on hillsides.
Honshu (Rikuzen, Etchu, and westxv.), Shikoku, Kyushu; quite common. s. Korea, China, and the Himalayas.