Cyperus gymnocaulos Steud.

Spring Flat-sedge

Syn. Pl. Glumac. 2: 12 (1854) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Tussock-forming perennial, occasionally proliferating, with short thick rhizome. Culms often trigonous above, otherwise terete, smooth, smaller and less robust than in C. vaginatus. Leaves reduced to sheaths, except in juvenile plants. Inflorescence head-like or with 1–3 subsidiary dense, globose clusters on branches to 2 cm long; digitate clusters to 1 cm diam.; involucral bracts very rigid, pungent, 2–4 obvious, shorter than to slightly exceeding inflorescence. Spikelets flattened, numerous per cluster, 3–6 mm long, 2–3 mm wide in side view, 8–20-flowered; rachilla not winged, persistent; glumes with 3-nerved keel but often with 1–2 faint nerves on sides, red-brown, 2–2.7 mm long; stamens 3. Nut trigonous, ellipsoid, yellow- to grey-brown, c. one-half as long as glume, c. 1 mm long, 0.5–0.7 mm diam. Flowers spring–summer.

CVU, DunT, Gold, LoM, MuF, MuM, MSB, NIS, RobP, VRiv, VVP, Wim. All mainland states. On banks of streams and lakes.

Cyperus gymnocaulos and C. vaginatus are very closely related and, although each occurs in pure form over considerable areas of Australia, inter-grades are not uncommon in some areas.

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.
Hero image
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 gymnocaulos in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cyperus gymnocaulos in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Murray Scroll Belt present native
Robinvale Plains present native
Murray Fans present native
Goldfields present native
Central Victorian Uplands present native
Dundas Tablelands present native
Northern Inland Slopes present native

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales