T: ‘J. D.’ [Port Jackson; Insula Van Diemen]; [New South Wales] Port Jackson, R.Brown [Bennett 5786]; lecto: BM, designated here; iso: DBN, K, NSW [The other original syntype from Tasmania, Table Mountain [Mt Wellington], R.Brown; orig. syn: BM, belongs to J. caespiticius. The lectotype is a more mature plant on the type herbarium sheet].
Perennials, (6–) 15–50 (–70) cm tall, densely caespitose; rhizome short; stolons absent; cataphylls absent. Leaves basal; sheaths open, pale brownish, usually suffused reddish; auricles absent; blades to c. 20 (–30) cm long, (1.5–) 2.5–6.0 (–11) mm wide, flat; apex acute. Lower bract leaf-like, to c. 10 cm long, shorter than inflorescence. Inflorescence usually diffuse, rarely subcongested, 2–12 cm long, anthelate, of 3–20 (rarely to 70) hemispherical (3–) 5–12 (–30)-flowered clusters c. 5–7 mm in diam.; peduncles slightly scabrid to smooth. Capitulum bracts lanceolate, acute, castaneous, paler towards margins. Tepals subequal or inner longer, (1.4–) 1.8–2.3 (–2.8) mm long; outer tepals carinate, castaneous to reddish brown, acute, usually with paler and thicker central band; inner tepals ovate-lanceolate, obtuse to ±acute, ±castaneous-brown, often with greenish later brownish central band; margins broad, membranous. Stamens 3 (rarely 4–6); anthers c. 0.4–0.5 mm long; filaments to c. 1.0 mm long; style 0.2–0.3 mm long; stigmas 0.4–0.5 mm long. Capsule ellipsoid to narrowly trigonous-ovoid, c. 2.0–2.5 mm long, golden brown to castaneous-brown, shiny; apex subobtuse, shorter than or ±equalling perianth, subabruptly narrowed into mucro 0.3–0.5 mm long. Seeds ±ovoid, c. 0.35–0.50 × 0.20–0.25 mm, pale brown, distinctly transversely reticulate; appendages absent.