Submerged bottom-rooted perennial aquatic. Stems are branched and < 3 m long. Leaves are in whorls around the stem, serrated and have spines on the underside midrib. Flowers are small and transparent with red streaks.
To help protect our environment:
Lakes, ponds, canals, slow-moving streams.
Seeds not set in New Zealand. Vegetative spread from tubers, turions, rhizomes and stem fragments, dispersed by water and contamination of livestock. Human-mediated dispersal through movement of contaminated boats, equipment and machinery.
Forms dense mats, displacing native vegetation and impeding waterways and recreational activities.
Do not attempt to undertake control of this species. Please report to the Ministry for Primary Industries.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.
Egeria lacks toothed leaf margins.
S naiad's leaves are on short branches.
Lagarosiphon has alternate leaves and lacks the toothed leaf margins.
