Erect, caespitose rhizomatous, annual or perennial, grass-like or herb (sedge), to 0.3 m high, spikelets +/- terete; flowers usually all with 3 stamens and 3 style branches; nut usually 3-angled. Fl. green-brown, Jun to Dec or Jan to Feb. Dark peaty or clay loam, sandy clay, silt, saline soils, granite. Swamps, pools, estuary margins, seepage areas, winter-wet depressions.