Perennials 50–75 cm tall, sparsely hairy to subglabrous; rhizome ascending. Basal leaves (5–) 10–20 (–25) cm long, usually 6–10 mm wide; cauline leaves usually 3–5, with sheath to 7 cm long, usually 9–15 cm long, up to 10 mm wide; all leaves acute with densely papillose-serrulate margins. Lower bracts similar to leaves, up to 17 cm long, distally gradually shorter (lower inflorescence branches often in axils of upper or middle cauline leaves). Inflorescence an interrupted ±drooping panicle in upper 1/3 (–1/2) of plant height, composed of dense oblong-ovoid partial inflorescences on long primary peduncles; further composed of cylindrical to oblong spike-like clusters 1–2 × 0.4–0.8 cm. Bracteoles membranous, ±lanceolate, 1.5–2.0 mm long, fimbriate-ciliate above. Tepals ±castaneous brown, subequal, with outer tepals (2.3–) 2.5–3.0 mm long, lanceolate, acuminate, glabrous or very sparsely ciliate; margin pale, indistinct to ±absent. Stamens usually 3, sometimes 4–5; anthers 0.4–0.5 mm long; filaments 0.6–0.7 mm long; style 0.4–0.5 mm long; stigmas c. 1.0–1.2 mm long. Capsule subglobose to obovoid, paler castaneous brown; capsule segments 1.5–1.8 × c. 1.2 mm, glossy. Seeds c. 1.0 mm long, 0.5–0.6 mm wide; seed-coat distinct, forming a pale apex; basal appendage c. 0.1 mm long, fibrillate.