Cyperus difformis L.

Variable Flat-sedge

Cent. Pl. 2: 6 (1756) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native (naturalised in part(s) of state)

Tufted annual with reddish roots. Culms triquetrous, smooth, 10–50 cm high, 2–3 mm diam. Leaves not septate-nodulose, shorter than or not much exceeding culms, 2–5 mm wide, sometimes reduced to sheaths. Inflorescence simple or rarely compound with 5–11 primary branches to 5 cm long, sometimes head-like; digitate clusters dense, 0.8–1.5 cm diam.; involucral bracts leaf-like, 1 or 2 longer than the inflorescence and usually one erect. Spikelets flattened, numerous per cluster, 2.5–5 mm long, c. 1 mm wide in side view, 10–30-flowered; rachilla not winged, persistent; glumes very obtuse, with 3-nerved keel, very dark red-brown or sometimes paler, with white margins, 0.6–0.9 mm long, c. 1 mm wide; stamens 1, rarely 2. Nut triquetrous, ellipsoid to obovoid, straw-coloured, almost as long as glume, 0.5–0.7 mm long, c. 0.3 mm diam. Flowers spring–summer.

CVU, GipP, Gold, MuF, MuM, MSB, NIS, RobP, VRiv, VVP. All mainland States. Pantropical. Locally common in seasonally wet, often disturbed open situations along the Murray River and its tributaries, recorded once as a nursery weed in Parkville, an inner Melbourne suburb. .

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.
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
genus Cyperus
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Cyperus difformis in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cyperus difformis in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Scroll Belt present native
Robinvale Plains present native
Murray Fans present native
Gippsland Plain present native
Goldfields present native
Central Victorian Uplands present native
Northern Inland Slopes present native

State distribution

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