Plants to more than 1 m tall, basally with several whitish or brownish, membranous sheaths which usually become reticulate fibers apically. Leaves sessile, basally clasping; leaf blade lorate, narrowly oblong, oblanceolate, or subfalcate, 25--32 × 2.5(--8.5) cm, glabrous or papillose-puberulent on abaxial veins, base narrowed, apex long acuminate. Panicle densely many flowered; lateral branches slender, with male flowers; terminal raceme with bisexual flowers; bracts 2--3 mm, abaxially woolly. Pedicel (1--)2--3(--4) mm. Tepals pale yellow or yellowish green, oblong or ovate-oblong, 4--7 × 2--4 mm, slightly pubescent at abaxial base, base shortly clawed, apex subacute. Ovary glabrous. Capsule erect, appressed to rachis. Fl. and fr. Jul--Oct.

* Shaded places in forests, forest margins, grassy slopes; 2000--4000 m. W Sichuan, NW Yunnan.