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Brazilian
Elodea - Egeria densa
Family: Hydrocharitaceae
Description
Brazilian Elodea is actually not in the genus Elodea, which gave it the common name. Instead its in the genus Egeria, which is closely related. Its native to south america and has been indroduced to the United states and become a problem plant. It is known in the Aquairum plant industry as "Anacharis." In fact, its one of the most common aquarium plants in use today.
Brazilian Elodea is generally more of a problem in the northern US than it is in the south. This is of course, speaking relative to its more invasive cousin, Hydrilla.
Egeria
densa is a plant that looks very similar to three other invasive
plants - Hydrilla verticillata and
Elodea canadensis. 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.
Interesting facts
Brazillian Elodea does not handle the hot summers of the south as well as Hydrilla. Because of this, it is not nearly as problematic a species as Hydrilla or Egeria.
Links to more information
-
Brazilian Aquatic Plant Managment in Washington
-
Brazilian Elodea info - AquaPlant information - Texas A&M.
-
The Beginner Plant, "Anacharis", Elodea & Egeria - how to understand the differences in names.
VIDEO
Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers
