Perennial submerged rooted aquatic herb. Submerged leaves are < 70 mm long, opposite, finely divided and fan-shaped. Floating leaves are < 20 mm long, alternate, entire and elongated. Flowers are small, white with yellow centres and borne above the water's surface in summer.
To help protect our environment:
Standing or slow-moving water bodies, lakes, ponds, reservoirs, ditches, streams.
Seed set is rare. Vegetative spread from stem fragments and rhizomes, dispersed by water. Human-mediated dispersal through dumping of aquarium waste and movement of contaminated boats and equipment.
Can form dense stands, displacing native aquatic herb species, altering habitat availability for fish and invertebrates and affecting water quality. Can impede recreational water access to water bodies.
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.