T: China, Yunnan, Tsang-chan, 3500 m, 20 Aug 1887, P.J.M.Delavay 2656; holo: P; iso: TI.
Perennials, 30–60 cm tall, robust, loosely caespitose; rhizomes long, creeping, covered with brownish scales, stout, 2–3 mm thick; stolons present. Stem erect, terete, 2–5 mm thick. Cataphylls 1–2, purplish-brown; leaves flat, grass-like; basal leaves 1–2, shorter than upper cauline leaves, 3–10 cm long including sheath, 1–1.5 cm wide; sheath 2–5 cm long; cauline leaves 2–4, 10–30 cm long, 1–2 cm wide; leaf margin broad-membranous, often ±serrulate; auricles obliquely ±absent. Lower bract leaf-like, exceeding inflorescence, 10–15 cm long, 3–6 mm wide, flat, grass-green. Inflorescence anthelate, 3–10 cm long, with 2–4 main branches and 1 to several secondary ones, of 3–8 subglobose 5–20-flowered heads 1–2 cm wide, subtended by several bracts, yellowish white; bracts of heads lanceolate to ovate-lanceolate, 3–15 mm long, 1.5–4 mm wide; sheath-like bract on peduncle membranous, lanceolate, 0.5–0.8 cm long. Flowers 6–8 mm long, 2–3 mm wide; pedicels 1.5–6.0 mm long. Tepals lanceolate; inner tepals 3.5–5.0 mm long, 0.8–2.5 mm wide; outer tepals 3.0–4.0 mm long, 0.8–2.4 mm wide, yellowish white. Stamens 6, ±not exserted, 2.6–3.3 mm long; anthers slightly longer than filaments, linear-elliptic, 1.4–1.8 mm long; filaments 1.2–1.5 mm long; style 1.3–1.5 mm long; stigmas 0.5–0.7 mm long; ovary ovoid-trigonous, 1.6–1.9 mm long, 0.8–1.0 mm wide. Capsule unilocular, oblong-ovoid, subtrigonous, acute, subabruptly contracted in a short mucro, 4.2–6.5 (–8) mm long, pale castaneous-brown, usually exceeding perianth. Seeds ovoid, 0.6–0.8 × 0.3–0.4 mm, 2.4–3.0 mm long including two appendages c. 0.8–1.1 mm long; outer seed-coat very loose.