Brazilian Elodea (Egeria densa) (also called Brazilian Waterweed, Anacharis)

Description:

Brazilian elodea
Brazilian elodea - photo from WI DNR

Appearance: Submersed aquatic plant. Perennial. Can be rooted or free floating.

Leaves: Bushy appearance. Leaves in whorls of 4 to 6. Leaf edges have very small serrations that require a magnifying glass to see.

Flowers: White flowers with 3 petals are on short stalks and are visible above water. Flowers are 0.7 to 1 inch wide.

Reproduction: Spreads by plant fragments. No female plants have been reported in the United States. Since all plants are male, no seeds are produced in the US. 

Note on identification: Brazilian elodea can be easily confused with native Canada waterweed.

  • Brazilian elodea usually has four leaves per whorl (arranged around the stem) and each leaf is at least 2 cm long.
  • Canada waterweed generally has three leaves per whorl and each leaf is usually less than 1 cm long.

See the reporting invasive aquatic plants webpage if you are unsure of identification or wish to report a new location of Brazilian elodea.

Ecological Threat:

 

Control Methods:

Prevention: Brazilian elodea is reported in very few lakes in Minnesota (see infested waters list This link leads to an external site.). By cleaning all plant parts off of boats and water-related equipment, we can prevent the spread of Brazilian elodea to additional lakes.

Mechanical or chemical: See DNR regulations for submersed aquatic plant management strategies and regulations. 

Additional resources: