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infestation in a wetland habitat (Photo: Sheldon Navie)
infestation in a sandy site (Photo: Forest and Kim Starr, USGS)
habit (Photo: Sheldon Navie)
habit (Photo: Forest and Kim Starr, USGS)
young seed-head (Photo: Sheldon Navie)
flower spikelets (Photo: Sheldon Navie)
the similar red sprangletop, Leptochloa panicea subsp. brachiata (Photo: Sheldon Navie)
red sprangletop (Leptochloa panicea subsp. brachiata) with reddish-coloured flower spikelets (Photo: Sheldon Navie)
Leptochloa fusca (L.) Kunth subsp. uninervia (J. Presl) N. Snow
Diplachne uninervia (J. Presl) ParodiLeptochloa uninervia (J. Presl) Hitchc. & A. ChaseMegastachya uninervia J. Presl
Gramineae (South Australia)Poaceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)
diplachne, Mexican sprangletop
Native to North America (i.e. USA and Mexico), Central America (ie.. Belize, Costa Rica, Honduras and Nicaragua), the Caribbean (i.e. the Bahamas, Cuba, Jamaica and Puerto Rico) and South America (i.e. Venezuela, Brazil, Bolivia, Ecuador, Peru, Argentina, Chile, Paraguay and Uruguay).
This species is becoming widely naturalised in many parts of Australia. It is now present in many parts of Queensland, in the coastal districts of central New South Wales, in south-eastern South Australia, in the northern and north-western parts of Western Australia, and in the Northern Territory.
Mexican sprangletop (Leptochloa fusca subsp. uninervia) is regarded as a "sleeper weed" or potential environmental weed in Queensland and New South Wales. It commonly grows in ditches and drains, on the edges of irrigation channels, on the margins of permanent river pools, and in dry creek beds. It is thought that this species poses a threat to brackish/saline and freshwater wetlands in the sub-tropical and temperate regions of Australia. Once established in these habitats it will compete with native grasses, sedges and other wetland plants, perhaps replacing some species and affecting populations of waterbirds and other wildlife.
Note: This species is very similar to the native brown beetle grass (Leptochloa fusca subsp. fusca) and the introduced red sprangletop (Leptochloa panicea subsp. brachiata).
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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