SafePlants

Brazilian Waterweed (Egeria densa)

Egeria densa, commonly known as Brazilian waterweed or Brazilian elodea, is a freshwater aquatic plant often found in aquariums. It's known for its rapid growth and potential to become invasive in certain environments.

Considerations for Pets

• This plant is commonly used in aquariums.

Taxonomy and Nomenclature

• Scientific Name: Egeria densa Planch.
• Common Names: Brazilian waterweed, Brazilian elodea, common waterweed, dense waterweed, leafy elodea, anacharis
• Synonyms: Anacharis densa (Planch.) Victorin, Elodea densa (Planch.) Caspary, Philotria densa
• Order: Hydrocharitales
• Family: Hydrocharitaceae (Frog's Bit family)

Distribution and Habitat

• Native to warm temperate South America, specifically southeastern Brazil, Argentina, and Uruguay.
• Found in freshwater systems, including streams, lakes, and ponds.
• May grow in substrates of sand, mud, or stone.
• Can be found at depths up to 22 feet.
• Reported occurrences in the Netherlands and the United States.

Ecological Role

• Considered an invasive species in many regions outside its native range.
• Forms dense, monotypic stands that can crowd out native aquatic plants.
• Degrades wildlife habitat.
• Spreads by fragments, contributing to its invasive potential.

Morphological Characteristics

• Submersed aquatic perennial herb.
• Bright green, slender stems, typically 1-2 feet long, but can reach up to 15 feet.
• Stems are approximately 1/8 inch thick.
• Leaves are small, smooth, and spear-shaped, arranged in whorls of two to six.
• Produces small, white flowers.

Quirky Facts

• It can clog up water systems.
• Brazilian waterweed can spread by fragments.