L.A.S.Johnson, Contr. New South Wales Natl. Herb. 3: 243 (1963)
T: New South Wales, Mongarlowe River at Northangera, 24. Dec 1961, B.G.Briggs; holo: NSW56850; iso: CHR129300.
Perennials, 55–160 (–200) cm tall; rhizome c. 5 mm thick, short-noded, forming dense stands. Stem terete, 1–3 (–3.5) mm diam., ±soft, yellow-green to mid-green; ridges 30–65 (–75), inconspicuous, low; dorsal cells not enlarged; subepidermal sclerenchyma strands present and some connected by short radial lamellae to intermediate-sized vascular bundles; pith of perfectly astericiform cells, interrupted with large lacunae or occasionally continuous above. Cataphylls 3–4; upper cataphylls 4–12 cm long, lax, abaxially yellow-brown and dull distally, dark red-brown and glossy at base, adaxially golden brown with slightly silvery shine. Inflorescence 1–5 cm long, diffuse or rarely head-like; flowers numerous, densely or occasionally loosely clustered in 2–10 pedunculate clusters. Lower bract 5–19 cm long, exceeding inflorescence. Bracteoles ovate, c. 1 mm long, acute, stramineous to membranous. Outer tepals 1.5–2 (–2. 5) mm long, slightly longer than inner ones, acute to acuminate, all stramineous-brown with narrow membranous margins. Stamens 3; anthers 0.4–0.5 mm long; filaments 0.5–0.7 mm long; style 0.1–0.2 mm long; stigmas c. 0.5–1.0 mm long. Capsule triseptate, ellipsoid to obovoid, 1.5–2 (–2.3) mm long, equalling or slightly exceeding perianth, obtuse, not or shortly mucronate, golden brown or rarely dark golden brown. Seeds obliquely obovoid, 0.4–0.5 × 0.2 mm, c. 14–18-striate, reticulate, yellow-brown; appendages absent.