Click on images to enlarge
infestation in a pasture (Photo: Troy Orchard)
infestation along a waterway (Photo: Troy Orchard)
habit (Photo: Chris Gardiner)
habit (Photo: Troy Orchard)
seed-heads (Photo: Troy Orchard)
younger seed-head in flower (Photo: Troy Orchard)
seed-head subtended by several long leafy bracts (Photo: Chris Gardiner)
close-up of brownish coloured seed-head (Photo: Chris Gardiner)
Scientific Name
Cyperus aromaticus (Ridl.) Mattf. & Kukenthal
Synonyms
Kyllinga aromatica Ridl.Kyllinga polyphylla Willd. ex Kunth.
Family
Cyperaceae
Common Names
Navua sedge
Origin
This species is native to sub-Saharan Africa (i.e. Somalia, Tanzania, Congo, Ghana, Guinea, Nigeria, Angola and South Africa), Madagascar, Mauritius and the Seychelles.
Naturalised Distribution
Naturalised in northern Queensland and also on Christmas Island. In northern Queensland it is present in the Mossman district, southwards to about 20 km south of Ingham in the Hinhinbrook Shire, and west to Kuranda.
It has also become naturalised in south-east Asia (i.e. Sri Lanka, Malaysia and Singapore) and on several Pacific Islands (i.e. Fiji, New Caledonia, Samoa, the Solomon Islands, Tahiti and Vanuatu).
Notes
This species is regarded as a very serious weed of pastures in the higher rainfall areas of northern Australia. It usually grows in full sunshine and is generally found in wetter pastures (including improved pastures), in drains, along roadsides, in gardens and in plantation crops. However, it is also thought to pose a significant threat to natural wetlands and waterways (i.e. riparian zones) in northern Australia.
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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