This is an erect, emergent herb which grows up to about 1 metre tall.
Larger stems can be quite robust.
Leaves grow in opposite pairs along the stem, are coarse in texture, have prominent veins and a distinct midrib.
Flowers are papery, white flower whorls borne in the axils of the leaves that turn brown upon maturity.
Habitat is a water plant but can grow along river banks.
Weed characteristics the aggressive growth of this plant poses a competitive threat to native water plants. It forms mats of dense, floating growth at the edges of freshwater lakes and rivers.
Dispersal stems sprout new roots from the nodes when in contact with soil.
This species is a Class 1 declared plant under Queensland legislation.
How to act
New infestations must be reported to Biosecurity Queensland on 13 25 23. The plant must be identified and removed by approved officers and have their locations recorded prior to removal. Mechanical or physical removal from waterways and foliar spraying with an appropriate herbicide are effective treatments.
Refer to Weed Control Methods.
This is a legacy website. Content is not being updated but is kept as an archive.
Updated NRM information is now held in the NQ Dry Tropics NRM Information Portal at http://nrm.nqdrytropics.com.au/.
while corporate information about NQ Dry Tropics is held on our main website at http://www.nqdrytropics.com.au