Habitat: coast, moist, roadside

Dispersal: Vegetative

Distribution from the Australasian Virtual Herbarium. CC-BY 3.0 AU
Distribution from the Australasian Virtual Herbarium. CC-BY 3.0 AU
 Recognition
  • a free-floating freshwater plant forming dense mats of vegetation on the water surface.
  • its folded 'leaves' are borne in pairs and emerge above the water surface.
  • it has submerged 'roots' that are highly divided and feathery in appearance.
  • its 'leaves' have a covering of egg-beater shaped hairs (about 1 mm long) on their upper surface.
  • sterile spore sacs are often present among the submerged 'roots'.

[From: Environmental Weeds of Australia]

 Images
© Walter Stahel
© Walter Stahel
Image: Rohan Wells © Rohan Wells
Image: Rohan Wells © Rohan Wells
Image: Paul Champion © Paul Champion
Image: Paul Champion © Paul Champion
Weeds Key – interactive key to the weed species of New Zealand
 References
Biosecurity New Zealand 2012: Regional Pest Management Strategies Database. http://www.biosecurityperformance.maf.govt.nz/
Biosecurity New Zealand 2008: National Plant Pest Accord. MAF Biosecurity New Zealand, Wellington.
Ministry for Primary Industries 23 Feb 2017: Unwanted Organisms Register. Version 02.01.02. https://www1.maf.govt.nz/uor