Rhizomatous, tufted perennial, herb, 0.2-1.2 m high, culms terete; spikelets erect, 10-20-flowered, with rigid black glumes at base and apex. Fl. brown, Sep to Oct. Peaty sand. Swamps and other wet or seasonally wet sites.
Beard’s Provinces: South-West Province.
IBRA Regions: Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions: Perth, Southern Jarrah Forest, Warren.
Local Government Areas (LGAs): Albany, Augusta-Margaret River, Busselton, Capel, Denmark, Manjimup, Nannup.
Rhizomes tufted, glabrous. Basal sheath glabrous, dull, striate. Culms terete, internal structure (at base of culm) hollow, glabrous, striate, not marbled, not fasciculate. Culm 420-710 mm long. Sheaths (including blade) dull, striate, glabrous, margins not 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. Male spikelet 15-20 mm long. Subtending bract glabrous, Outer bract 6.4-7.8 mm long, margins firm and opaque, Apex acute. Perianth glabrous. 5.3-5.7 mm long. Inner bract glabrous, margins firm and opaque, Apex acute. Inner bract 5.4-5.5 mm long. Filament 2.6-3.5 mm long. Anther 2.3-3.5 mm long. Female spikelet 15-25 mm long. Subtending bract hairy, margins firm and opaque, Apex acute. Outer bract 5.5-7.2 mm long. Perianth glabrous. 7-8.5 mm long. Inner bracts 7.4-7.7 mm long, hairy, margins firm and opaque, Apex acute. Style two (or two-branched). 7.3-9 mm long. Fruit bilocular (capsule). Flowering Time September or October. Botanical Province South-West, IBRA Bioregions Swan Coastal Plain, Jarrah Forest or Warren.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/