Cladium procerum

Tall, rhizomatous perennial, often forming extensive clumps. Culms ± terete, smooth, glabrous, 1–2.5 m high, 5–10 mm diam., often branching extravaginally at nodes. Leaf-blades to 2.5 m long, 5–20 mm wide; sheaths yellow-brown at base. Inflorescence loose, interrupted-oblong in outline, 18–35 cm long, 6–9 cm diam.; involucral bracts longer than inflorescence. Spikelets often with only the lower flower bisexual, 3–5 mm long; glumes 5 or 6, obtuse to acute, red-brown, glabrous, about 4 lowest empty, shorter than fertile glumes, which are 3.5–4.0 mm long; style 3-fid; style-base inconspicuous at maturity. Nut ellipsoid to ovoid, glabrous, smooth, shining, mid-brown, 2.0–2.5 mm long, 1.3–2 mm diam., with basal disk inconspicuous and often remaining with spikelet. Flowers spring–summer.