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The Target 10 Homepage co-ordinates actions and organisations in understanding and controlling problem species. Ireland's National Plant Conservation Strategy is a response to the Global Strategy for Plant Conservation This webpage acts as the focal point and clearing-house for progress in implementing this Strategy 
National Botanic Gardens Home Page
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Egeria densa
| Last updated 12th February 2008
STATUS
Egeria densa is known to be highly invasive in many warm temperate to subtropical regions of the world.
In Ireland to date it has only been recorded in a single wild station - Lough Nasool near Riverstown
in county Sligo in 1988.
There is a potential for this plant to become widespread with warmer water temperatures.
Egeria differs from the Elodea species by having leaves in whorls of 4-5.
This species is distinguished from the other invasive pondweeds Elodea and Lagarosiphon
by the leaves being in whorls of 4-5, unlike the whorls of 3 in Elodea (belwo left) or the spirally-arranged leaves of Lagarosiphon (below right).
In flower the plant is unmistakable, having 3 broad petals, unlike the minute flowers of Elodea or Lagarosiphon.
CONTROL
Control is probably best achieved through chemical means as with Elodea.
ACTIONS
No actions are currently planned. Vigilance for when outbreaks of the species may occur is the most important action at present
CONTACTS
REFERENCES
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