Click on images to enlarge
habit (Photo: Sheldon Navie)
habit with young seed-heads (Photo: Sheldon Navie)
habit with mature seed-heads (Photo: Sheldon Navie)
young seed-head with numerous branches (Photo: Sheldon Navie)
seed-head subtended by several large leafy bracts (Photo: Sheldon Navie)
close-up of mature seed-head (Photo: Sheldon Navie)
close-up of mature flower spikelets (Photo: Sheldon Navie)
young plant (Photo: Sheldon Navie)
Cyperus eragrostis Lam.
drain flat sedge, drain flat-sedge, nutsedge, pale galingale, tall flat sedge, tall flatsedge, tall umbrella sedge, tall umbrellaplant, umbrella grass, umbrella sedge
Native to USA (i.e. New Jersey, Oregon, Washington, Louisiana, Mississippi, Texas, California) and South America (i.e. Surinam, Brazi, Bolivia, Peru, Argentina, Chile and Uruguay).
Widely naturalised in southern and eastern Australia (i.e. in south-eastern Queensland, New South Wales, the ACT, Victoria, Tasmania, many parts of South Australia and south-western Western Australia).
Also naturalised on Lord Howe Island and in many other parts of the world (i.e. Europe, southern Africa, tropical Asia, New Zealand and parts of North America beyond its native range).
This sedge is an important weed of rice crops and irrigation channels and also grows in gardens, parks, disturbed sites, waste areas and damp environments (i.e. along waterways and in wetlands). It is regarded as an environmental weed in New South Wales, Victoria and Western Australia.
Drain flat-sedge (Cyperus eragrostis) appears on several local environmental weed lists in New South Wales and Victoria and has been recorded in conservation areas in these states (e.g. in Narran Lake Nature Reserve, near Lightning Ridge in inland northern New South Wales, and in John Gardiner Reserve in suburban Melbourne). In south-western Western Australia it grows in irrigated pastures, wetlands and swamps and is listed as a moderately invasive species in the Environmental Weeds Strategy of Western Australia. Drain flat-sedge (Cyperus eragrostis) is also one of several exotic weeds growing in the limited riparian areas occupied by the seriously endangered Tuggeranong lignum (Muehlenbeckia tuggeranong), along the Murrumbidgee River in the ACT.
Fact sheets are available from Department of Employment, Economic Development and Innovation (DEEDI) service centres and our Customer Service Centre (telephone 13 25 23). Check our website at www.biosecurity.qld.gov.au to ensure you have the latest version of this fact sheet. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it.
Copyright © 2016. All rights reserved. Identic Pty Ltd. Special edition of Environmental Weeds of Australia for Biosecurity Queensland.
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