T: [Australia], J.P.Verreaux [Nouv. Holland] 126; lecto: W, designated here by K.L.Wilson [duplicates usually mixed with J. prismatocarpus]; residual original syn: [New South Wales] Neu-England, C.Stuart; syn: K; Queensland, Perrot; syn: K.
Perennials, 8–45 cm tall, densely caespitose or caespitose; rhizome very short to shortly ascending; stem terete to slightly compressed, 0.9–2.0 mm in diam. Cataphylls 0–1. Cauline leaves 2–4, yellowish green, ±evenly spread along stem, unitubular, perfectly septate, terete to ±compressed, usually 4–12 cm long, 0.8–2.3 mm wide; auricles 1.5–3.0 mm long, ±scarious. Lower bract leaf-like, 3–23 cm long, shorter or exceeding inflorescence. Inflorescence diffuse, 3–18 cm long, decompound, of 3–20 ±large, subglobose 5–20-flowered heads to c. 1 cm diam. Tepals ±unequal; inner tepals usually slightly longer, narrowly lanceolate; outer tepals distinctly carinate, 3–5 mm long, acuminate, greenish, later stramineous-brown, usually with a red-brown apex, or evenly red-brown; margins narrow, membranous. Stamens 6; anthers 0.5–0.7 mm long; filaments 1.0–1.4 mm long; style c. 0.1–0.2 mm long; stigmas c. 0.6–1.0 mm long. Capsule unilocular, acutely trigonous, narrowly prismatic, usually 4–6 mm long, evenly tapering to acuminate apex, much exceeding perianth, golden brown, often castaneous at apex. Seeds ±ellipsoid, apiculate, 0.5–0.6 × c. 0.2–0.3 mm, pale brown, reticulate; appendages absent.