Perennials, c. 2–20 cm tall, caespitose; rhizome long, creeping-ascending, rooting, distally, much branched, wiry, castaneous to pale brown. Stem base covered with stramineous scales. Leaves tufted, both basal and cauline, unitubular, terete to ±compressed, perfectly septate, acute, c. 3–10 (–20) cm long, 0.4–1.0 mm in diam., exceeding stems; sheaths broad, conspicuous, pale green to stramineous, with 2–4 veins on each side; sheath margins broad, stramineous to scarious; auricles obtuse, scarious, 0.3–1.0 mm long. Lower bract with a broad loose sheath and short acute blade, c. 0.5–7 [in Macquarie Is. specimens] cm long, usually exceeding inflorescence. Inflorescence a single head (or with 2 extra heads; or up to 3 clusters in Macquarie Is. specimens); head sessile, cup-shaped, 3–5 (8)-flowered, to 8–9 mm in diam. Tepals ±equal, or outer slightly longer, ±lanceolate, (3.5 in Macquarie Is. specimens)–5.2 mm long; outer tepals subacute; inner tepals ±obtuse; central band greenish; base distinctly veined; tepal border castaneous to deep brown. Stamens 6, subequalling tepals; anthers 0.7–1.9 mm long (0.7 mm in Campbell Is. specimens, 0.8–1.0 mm in Macquarie Is. specimens); connective sometimes minutely mucronate (c. 0.2 mm long); filaments 1.5–2.5 mm long; style 0.7–1.5 mm long; stigmas 1.5–2.5 mm long. Capsule unilocular, oblong-ovoid to ellipsoid-trigonous, ±acuminate, c. 3.5–4.3 mm long, castaneous to blackish-brown, ±shiny, usually slightly exceeding (rarely equalling) perianth. Seeds ±ovoid, c. 0.5–0.6 × 0.3–0.4 mm, reticulate, pale castaneous-brown; appendages absent. 2n = 40, fide D.M.Moore, Bot. Not. 113: 187 (1960); D.M.Moore, Bull. Brit. Antarc. Surv. 14: 73 (1967), n.v.