Isolepis fluitans (L.) R.Br.

Floating Club-rush

Prodr. 221 (1810) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Slender aquatic or terrestrial perennial. Culms weak, filiform, leafy, submerged and elongated, or creeping and procumbent, or erect and tufted and to 10 cm high. Spikelets solitary, elliptic in outline, strongly flattened, 5–10(–15)-flowered, 3–5 mm long; involucral bract shorter than to slightly exceeding spikelet, glume-like or with a short thickened appendage; glumes obtuse, conspicuously numerous-nerved, straw-coloured with red-brown patches, 1.7–2.8 mm long; stamens 2 or rarely 3; anthers 0.5–1.0 mm long; style 2-fid. Nut plano-convex, with angles not well-defined, broad-obovoid to ellipsoid, smooth, minutely reticulate, shining, grey-brown to dark brown, from one-half to three-quarters as long as glume, 1.4–1.8 mm long, c. 1 mm diam. Flowers spring–summer.

CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HFE, HNF, HSF, LoM, MonT, MuF, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, WPro, Wim. Widespread in swamps and streams, mostly in the cooler, southern parts of the State, but extending north near St Arnaud, Nagambie, Wangaratta areas.

3 varieties, 2 in Victoria. Variety nervosa (Hochst. ex A.Rich.) Lye is endemic to Ethiopia.

Source: Wilson, K.L. (1994). Cyperaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Andre Messina, 2014-09-02
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
genus Isolepis
Higher taxa
Subordinate taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Isolepis fluitans in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Isolepis fluitans in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Wimmera present native
Glenelg Plain present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Fans present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Highlands-Far East present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory