Perennials, 60–165 cm tall, densely caespitose; rhizome creeping, very short-noded, 4–8 mm diam. Stem leafless, terete, (1–) 4–10 mm diam., ±soft, mid-green; ridges 65–160, ±indistinct; dorsal cells ±not enlarged; subepidermal sclerenchyma strands present, forming radial lamellae; pith of astericiform cells, interrupted with large lacunae. Cataphylls 2–4, lax; upper cataphylls to 20 cm long, with awn-like blade to 3 mm long, abaxially dull pale brown distally, dark red-brown to black and slightly glossy at base, adaxially pale golden brown to coppery, ±glossy. Lower bract (5–) 9–19 cm long, exceeding or rarely shorter than inflorescence, usually slightly dilated and abruptly constricted below the inflorescence. Inflorescence pseudolateral, 4–13 cm long, diffuse or subcongested; flowers numerous, loosely to densely clustered. Bracteoles broadly ovate, c. 1–1.3 mm long, scarious-stramineous. Tepals lanceolate; outer tepals 2–3 mm long, longer than or equalling inner ones, acute, stramineous-brown, membranous margins absent in S American but developed in Australian material; inner tepals subacute or obtuse and mucronate. Stamens 3; anthers 0.5–0.7 mm long, equalling c. 0.5–0.6 mm filaments; style c. 0.2 mm long; stigmas c. 0.5 mm long. Capsule triseptate, ellipsoid, 2–2.5 mm long, slightly shorter than or equalling perianth, obtuse, not or shortly mucronate, golden brown, often darker at apex. Seeds 0.4–0.5 × c. 0.2 mm, obliquely oblong, finely reticulate, yellow-brown.