Hymenachne

Status of hymenachne in Tasmania

(Hymenachne amplexicaulis)

Hymenachne
  • 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).
  • The legal responsibilities of landholders and other stakeholders in dealing with hymenachne are laid out in the hymenachne Statutory Weed Management Plan.

What does hymenachne look like?

  • Hymenachne 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 the nodes.
  • 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.

Hymenachne2
Image top: hymenachne (Image: Photostream)
Image above: hymenachne (Image: Photostream)


Impacts of hymenachne

  • 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 native animals.
Where does hymenachne occur?
  • Hymenachne 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.


See also
Hymenachne Statutory Weed Management Plan
Weed Links and Resources

Other useful links
Pest Genie
APVMA
Weeds in Australia - Weed Management Guide

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