Cyperus rigidellus (Benth.) J.M.Black

Fl. South Australia 676 (1929) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Threat status:Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988

Slender annual or tufted perennial, occasionally viscid. Culms triquetrous to terete, often scabrous above, 3–25 cm high, 0.6–1.3 mm diam. Leaves not septate-nodulose, mostly longer than culms, usually curly at the apex, to 3 mm wide. Inflorescence head-like or simple, with 1–4 branches 1–6 cm long; clusters dense to loose, subdigitate, hemispherical to globose, to 3 cm diam.; involucral bracts leaf-like, 2–4 much exceeding inflorescence. Spikelets flattened, 5–15 per cluster, 4–25 mm long, 2.5–4 mm wide in side view, 6–25-flowered; rachilla narrowly to broadly winged; glume spacing 1.3–2.3 mm; spikelet falling as unit, or rachilla persistent; glumes acute to obtuse with straight to excurved mucro to 0.4 mm long, with 2–3-nerved sides, straw-coloured tinged red-brown or evenly red-brown, 1.8–3.7 mm long; stamens 3; style 3-fid. Nut trigonous, narrow-obovoid to very narrow-ellipsoid, pale brown, nearly as long as glume, 1.3–3.2 mm long, 0.5–0.8 mm diam., falling with glume only if spikelet is viscid. Flowers spring–summer.

MuM, RobP. All mainland states. Grows in ephemerally wet situations such as lake beds, floodways and roadside drains in the far north-west (e.g. Hattah, Robinvale and Jeparit areas). .

A variable species that may include several taxa.

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 rigidellus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cyperus rigidellus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Murray Mallee present native
Robinvale Plains present native

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales