Stem 30–70 cm tall, rigid, erect, usually 1.5–2.5 mm in diam.; leaves (10–) 20–45 cm long, 1.5–3 mm thick. Inflorescence 4–10 × 2–5 cm, lax, with 8–30 well separated heads. Lower bract 3–7 (–15) cm, including a sheath 1.5–2.5 cm long, longer or slightly shorter than inflorescence; second lowest bract usually inconspicuous, 1.5–4 cm long, including sheath 1–2 cm long; middle bracts usually with no or only small laminas. Heads (3–) 4–5 (–8)-flowered. Tepals 2.5–3.5 mm long; outer tepals cymbiform, keeled and thickened by spongy tissue basally, obtuse, with mucro 0.1–0.3 mm long. Anthers 1.4–2.0 mm long, 4–8 times as long as filaments; style 1–1.5 mm long; stigmas 1–1.5 mm long. Capsule 2.8–3.5 mm long, equalling or slightly exceeding tepals, spheroidal with obtuse or shortly conical apex; mucro c. 0.2 mm long. Seeds 0.75–0.8 mm long, or 1.2–2.0 mm long including appendages; appendages conspicuously unequal.