Rhizomatous, robust perennial, herb (sedge-like), 0.3-1 m high. Swampy black sand or clay. Seasonally wet swamps.
Rhizomes tufted, glabrous. Basal sheath glabrous, dull, striate. Culms flattened, internal structure (at base of culm) hollow, glabrous, striate, marbled, not fasciculate. Culm 330-860 mm long. Sheaths (including blade) spreading, dull, not striate, glabrous, margins translucent. Apex elongated, glabrous. Dioecious (with separate male and female plants). Male and female inflorescences similar, posture (male inflorescences only) More or less erect, Culms unbranched below the inflorescence. Female spikelet 5-10 mm long. Subtending bract glabrous, margins firm and opaque, Apex acuminate to attenuate. Outer bract 2.8-4 mm long. Perianth glabrous. 2.8-3 mm long. Inner bracts 2-4 mm long, glabrous, margins firm and opaque, Apex acuminate to attenuate. Style three (or three-branched). 1.5-2 mm long. Fruit trilocular (capsule). Flowering Time October (?). Botanical Province South-West, IBRA Bioregions Jarrah Forest or Warren. Conservation Code Priority One (P1).