A quote from "Flora of the A.C.T." Nancy T. Burbidge & Max Gray: "the uppermost leaf sheath thickened, truncate and mucronate at orifice". Mucronate means "ending with a stiff point". The Sample Photos show this feature, which is diagnostic of the species. The drawing below is from that book.
Eleocharis acuta is listed in the following regions:
Canberra & Southern Tablelands | Albury, Wodonga | South Coast | Far West New South Wales | Loddon Mallee
Maps
Albury Aranda Bushland Back Creek TSR Bibbenluke Common Black Mountain Bluetts Block (402, 403, 12, 11) Broulee Moruya Nature Observation Area Bruce Ridge Bruce Ridge to Gossan Hill Brundee Swamp Nature Reserve Bullen Range Conder Community Wetlands Crace Grasslands Dryandra St Woodland Dunlop Grasslands Eurobodalla National Park Flea Bog Flat, Bruce Four Winds Gibraltar Pines Gorman Road Bush Reserve, Goulburn Goulburn Mulwaree Council Hall Horse Paddocks Hughes Grassy Woodland Illawong Nature Reserve Industrial Estate Wetlands Isaacs Ridge Isaacs Ridge and Nearby Isaacs Ridge Offset Area Jerrabomberra Grassland Kosciuszko National Park Lake Burley Griffin Central/East Lawson North Grasslands Lions Youth Haven - Westwood Farm A.C.T. Mcleods Creek Res (Gundaroo) Meroo National Park Mogo State Forest Mount Ainslie Mount Majura Mount Mugga Mugga Mount Painter Mount Taylor Mungabareena Nail Can Hill National Arboretum Forests National Environment Centre (Riverina Institute of Tafe) Normans Lagoon Panboola Pine Island to Point Hut Piney Ridge Point Hut to Tharwa Red Hill Nature Reserve Red Hill to Yarralumla Creek Rob Roy Range Seven Mile Beach National Park South East Forest National Park Sth Tablelands Ecosystem Park Suttons Dam Tanja Lagoon The Pinnacle Tuggeranong Hill Wanniassa Hill WL00036 Wodonga Wonga Wetlands WREN ReservesPlaces
Binalong, NSW Bungonia, NSW Gundaroo, NSW Gunning, NSW Hackett, ACT Lade Vale, NSW