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Elodea - Elodea canadensis
Family: Hydrocharitaceae

Description

Elodea looks very similar to Egeria and Hydrilla (see below). There are however some distinctions for Elodea. In particular this plant is smaller and has whorls of three (rarely 4). It is entirely submersed except for its white flowers that are sent to the surface on small, delicate shoots.

Interesting facts

Elodea canadensis is a native species to the United states, but can still be considered a weed because of its growth habits. It is more of a noxious plant however, outside the US, in such areas as Asia and Australia, where its not native.

Links to more information

Canadian Waterweed link (Elodea canadensis) - Ecology of the Northwoods.
Sumersed Elodea - Washington Ecology

Differentiating Elodea from Egeria and Hydrilla

Elodea canadensis is a plant that looks very similar to two other invasive plants - Hydrilla verticillata and Egeria densa. There are however some easy ways to tell the difference. First of all, Egeria has the largest leaves of any of them, growing up to 1/2 inch in diameter and 3/4 to 5/4 inches long. Unlike Elodea, which is much smaller and has whorls of 3 (rarely 4), Egeria has whorls of from 4-6, but never 3. Hydrilla usually has whorls of 5. Finally, while Elodea and Egeria have smooth leaves, Hydrilla's feels rough to the touch. This is because there are small teeth on the midrib. With this information, you should be able to distinguish these three major noxious aquatic plants.

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