Sagittaria

Status of sagittaria in Tasmania

(Sagittaria platyphylla)

Sagittaria
  • Sagittaria is a declared weed in Tasmania under the Tasmanian Weed Management Act 1999. The importation, sale and distribution of sagittaria are prohibited in Tasmania.
  • The legal responsibilities of landholders and other stakeholders in dealing with sagittaria are laid out in the Sagitarria Weed Management Plan.


What does sagittaria look like?

  • Sagittaria is a perennial (long-lived), emergent aquatic herb that grows to around 1.2 metres high in shallow permanent water bodies. Unlike most other species of this genus (for example the weed arrowhead, S. montevidensis), the above-water leaves do not have basal lobes giving them an arrow-like shape. Instead the leaves are ovate in shape, 25 cm long and 8 cm wide. Sagittaria also produces submerged leaves that are strap-like and grow to 50 cm long.
  • The flowering stems are erect and bear whorls of three at the apex. The flowers are white and have three petals. Sagittaria has fibrous roots and fleshy rhizomes (underground stems). The leaves and flowering stems arise from the rhizomes.
  • Spread is via seed. Seed is spread in water, and in mud adhering to machinery, boots and animals. Sagittaria has also been spread as part of the ornamental plant trade.
SagittariaSagittaria
Image top: Sagittaria platyphylla flowering
Image above left: Flower of the Sagittaria platyphylla
Image above right: Sagittaria platyphylla
All photos by Hugh Wilson


Impacts of sagittaria

  • Sagittaria is a serious weed of irrigation channels and drainage ditches.


Where does sagittaria occur

  • Sagittaria is a native of North America. On mainland Australia, sagittaria has naturalised in New South Wales, Victoria and South Australia.
  • Sagitarria has not naturalised in Tasmania.


What you need to do

  • If you locate sagittaria anywhere in Tasmania, or if you find a plant that you think could be sagittaria, immediately contact your Regional Weed Management Officer on 1300 368 550 to report this weed.


See also
Sagitarria Weed Management Plan
Weed Links and Resources

Other useful links
Pest Genie
APVMA


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