Cyperus rotundus L.

Nutgrass

Sp. Pl. 45 (1753) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Rhizomatous perennial with slender rhizomes forming ovoid to ellipsoid, woody tubers 0.5–1 cm diam., which annually shed their grey-brown, fibrous coat. Culms triquetrous, smooth, 15–30(–60) cm high, 1–2 mm diam. Leaves not septate-nodulose, shorter than culms, 2–6 mm wide. Inflorescence mostly simple with 3–9 primary branches to 10 cm long; spikes short, ovoid, to 2.5 cm long, to 3 cm diam.; involucral bracts leaf-like, 2–4 not or slightly exceeding inflorescence. Spikelets flattened, 3–10 per spike, 10–40-flowered, 10–25(–30) mm long, 1.5–2.5 mm wide in side view; rachilla broadly winged, persistent; glumes obtuse, with sides 1–3-nerved, 3–3.5 mm long; stamens 3; style 3-fid. Nut rarely maturing in Victoria, trigonous, narrowly obovoid to ellipsoid, dark grey-brown, less than one-half as long as glume, c. 1.5 mm long, c. 0.5 mm diam. Flowers spring–summer.

*CVU, *GipP, *MuF, *MuM, *NIS, *VRiv, *VVP, *Wim. Naturalised in all mainland States. Native to Africa, Asia. A locally common and troublesome weed in disturbed situations, mostly around habitation but occasionally infesting crops.

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: Val Stajsic, 2019-02-18
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Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
genus Cyperus
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Cyperus rotundus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cyperus rotundus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present naturalised
Wimmera present naturalised
Victorian Volcanic Plain present naturalised
Victorian Riverina present introduced
Murray Fans present naturalised
Gippsland Plain present naturalised
Central Victorian Uplands present naturalised
Northern Inland Slopes present naturalised

State distribution

Distribution map
State
Western Australia
Northern Territory
South Australia
Queensland
New South Wales
Australian Capital Territory
Victoria