Herbs, perennial, cespitose, rhizomatous. Culms roundly tri-gonous, 80–120 cm × 3–6 mm, glabrous. Leaves 5–12, V-shaped, 30–75 cm × 8–14 mm, septate, leathery, margins harshly scabrid. Inflorescences: spikes 1–4 per ray, loosely ovoid to broadly ellipsoid, 12–20 × 8–12 mm; rays 6–9, 3–10(–12) cm; 2d order rays 1–4, 1–2 cm; rachis 4–12 mm; bracts 5–10, horizontal to ascending at 30°, 15–40 cm × 4–8(–11) mm; rachilla deciduous, wings persistent, hyaline, fragile, 0.3 mm wide, covering less than 1/2 of achene. Spikelets 40–80, narrowly ellipsoid to ellipsoid, roughly quadrangular to weakly flattened, 5–8 × 1.2–1.5 mm; distal spikelet spreading or ascending; floral scales (1–)2(–3), ascending, brick red, medially greenish, laterally 3–4-ribbed, medially 1–3-ribbed, green, ovate, 2.2–3.5 × 1.5–1.8 mm, apex subacute. Flowers: anthers (0.7–)1–1.5 mm, filaments 4–4.7 mm; styles 0.5–0.9 mm; stigmas 2–3 mm. Achenes brown, ellipsoid to oblong-fusiform, 1.7–1.8 × 0.7 mm, base cuneate, apex subacute and apiculate, surfaces finely puncticulate to glabrous.
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Perennial herb, tufted, up to 2.8 m high. Leaf blades 5.2-12.6 mm wide, V-shaped. Culm scapose, 3-angled, 2.2-5.0 mm in diam. Inflorescence a compound anthela of 7-11 spikes, spikes shortly cylindrical or elliptical, 17-25 x 12-23 mm. Subtending bracts 4-10, leaf-like. Spikelets ± compressed, lanceolate, 5.2-10.5 x 0.8-1.8 mm. Glumes imbricate, ovate when flattened, 2.5-4.0 mm long, keel non-excurrent or excurrent into very short point. Flowering time Sept.-Jan. Nutlet narrowly elliptical, 1.8-2.3 x 0.7-0.8 mm, 3-angled, dark brown, surface minutely reticulate.
Tall, tufted, perennial herb, up to 1 m high. Inflorescence a terminal, compound umbel of 7-11 primary rays. Spikes consisting of loosely arranged spikelets. Glumes reddish brown.
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