LakeStewardship


Hydrocharitaceae
Frogbit Family

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Elodea canadensis - Canadian Waterweed

Common in lakes, ponds and streams. May grow to nuisance densities in nutrient-rich waters. Looks similar to non-native invasives Egeria and Hydrilla. Elodea canadensis has blunt-ended leaves in whorls of 3, whereas Egeria and Hydrilla have leaves with acute (more pointed) tips arranged in whorls of four. Hydrilla leaves are also have sharply serrated edges.
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis
Little Clear Pond Outlet, August 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Growth Habit, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Flowers, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Flowers, Little Clear Pond Outlet, September 2002
Elodea canadensis in stream
Flowers, Little Clear Pond Outlet, September 2002

Comparison between Elodea, Egeria and Hydrilla

Comparison between Elodea, Egeria, and Hydrilla
Comparison of morphological features

Egeria
Egeria

Hydrilla
Hydrilla

Vallesneria americana - Tapegrass
Similar in appearance to some species of Sparganium, the two genera can be distinguished when flowering structures are present. Vallesneria has a single submerged flower on a long stalk which extends nearly to the surface, whereas Sparganium has bur-like flowers and fruiting bodies at the end of a leaf stalk. In the abscence of fruiting bodies, the plants can sometimes be distinguished by the leaf vein structure. Vallesneria has a prominant lacunae band (specialized air tissue) in the center of the leaf, whereas Sparganium does not.
Vallesneria americana
Growth habit. Lake Clear, August 2002
Vallesneria americana
Growth habit. Lake Clear, August 2002
Vallesneria americana
Growth habit. Lake Clear, August 2002
Vallesneria americana
Growth habit, roots & shoots. Lake Clear, August 2002
Vallesneria americana
Growth habit, tops and flowering structures. Lake Clear, August 2002
Vallesneria americana
Closeup on flowering structures. Lake Clear, August 2002
Vallesneria americana
Closeup on flowering structures. Lake Clear, August 2002
Vallesneria americana
Leaf detail. Lake Clear, August 2002
Vallesneria americana
Leaf detail. Lake Clear, August 2002
Vallesneria americana
Leaf detail. Lake Clear, August 2002
Vallesneria americana
Magnification of leaf showing prominant lacunae band. Lake Clear, August 2002
Vallesneria americana
Magnification of leaf showing prominant lacunae band. Lake Clear, August 2002

Line drawing of Vallisneria
Line drawing of Vallisneria


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copyright © Michael R. Martin 2003-2015
Last updated: Friday, January 22, 2016 4:11 PM