Perennial floating stoloniferous aquatic. Roots are feathery, clustered and < 45 cm long. Stolons are < 60 cm long and hairy. Leaves are light green, hairy, prominently ribbed, formed in lettuce-like rosettes and have wavy margins. Flowers are minute and borne in clusters within leaf axils. Fruits are small berries containing wrinkled disc-like seeds.
To help protect our environment:
Still and slow-flowing water bodies, lakes, dams, rivers, ponds, streams.
Seeds dispersed by water and wind. Vegetative spread from stolons and budding. Human-mediated dispersal through dumping of aquarium or ornamental pond waste and movement of contaminated boats and equipment.
Forms dense mats, outcompeting native plants and reducing water quality. Clogs waterways, impeding drainage and recreational activities.
Do not attempt to undertake control of this species. The Ministry of Primary Industries will carry out the control of this species.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.