Status of hymenachne in Tasmania(Hymenachne amplexicaulis)
- Hymenachne is a declared weed in Tasmania under the Tasmanian Weed Management Act 1999. The importation, sale and distribution of hymenachne are prohibited in Tasmania.
- Hymenachne is also a Weed of National Significance (WONS).
legal responsibilities of landholders and other stakeholders in dealing
with hymenachne are laid out in the hymenachne Statutory Weed
What does hymenachne look like?
is a perennial, robust grass growing to 2.5 metres tall. It can grow
above or below water, with its roots in the ground. The stems can form
stolons that run along the ground and produce new plants by rooting at
- It has long leaves (100 to 450 mm) and the leaf base
may be up to 30 mm wide and covered with long hairs. The upper part of
the leaf is narrower and without hairs. The leaf blade is heart-shaped
at its base where it clasps around the stem. Flowers occur as a long,
cylindrical cluster at the end of a spike.
- Spread is via seed and broken stem fragments. Seed and stem fragments are spread by water and in mud on animals and birds.
Image top: hymenachne (Image: Photostream)
Image above: hymenachne (Image: Photostream)
Impacts of hymenachne
Where does hymenachne occur?
- Hymenachne is a
serious weed of water bodies and seasonal wetlands. It grows into dense
stands, outcompetes native plants and reduces the habitat available to
is a native of South and Central America. In Australia, hymenachne has
naturalised in Queensland, Western Australia and the Northern Territory.
- Hymenachne does not occur in Tasmania.
What you need to do
- If you locate
hymenachne anywhere in Tasmania, or if you find a plant that you think
could be hymenachne, immediately contact your Regional Weed Management
Officer on 1300 368 550 to report this weed.
Hymenachne Statutory Weed Management Plan
Weed Links and Resources
Other useful links
Weeds in Australia - Weed Management Guide
To the extent
permitted by law, the Tasmanian Department of Primary Industries, Parks,
Water and Environment (including its employees and consultants)
excludes all liability to any person for any consequences, including but
not limited to all losses, damages, costs, expenses and any other
compensation, arising directly or indirectly from using information or
material (in part or in whole) contained on this website.