Egeria densa

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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Order: Hydrocharitales
Family: Hydrocharitaceae
Genus: Egeria
Species: densa
Scientific Name
Egeria densa
Planch.
Scientific Name Synonym
Philotria densa
N/A
Elodea densa
(Planch.) Caspary
Anacharis densa
(Planch.) Victorin
Common Names

Brazilian waterweed, Brazilian waterweed, Brazilian elodea, South American waterweed

Overview

Appearance
Egeria densa is a submersed aquatic plant that invades freshwater systems throughout much of the United States. Often confused with hydrilla, Egeria densa has a smooth midrib on the underside of the leaf, whereas hydrilla has small teeth.
Foliage
The finely serrated leaves are usually less than 1 in. (2.5 cm) long and occur in whorls of 3-6.
Flowers
The flowers, which bloom above the surface of the water, are white with three petals.
Fruit
Outside of its native habitat, Egeria densa only reproduces vegetatively. Special double nodal regions can produce lateral buds, branches and roots. Only a double node can produce a new plant when it breaks off from the parent plant.
Ecological Threat
Egeria densa invades both still and flowing water ecosystems including lakes, ponds, ditches, and rivers. It can form dense stands that crowd out native vegetation and reduce the area's value as fish habitat. It can also interfere with recreational activities such as fishing and swimming. This plant was first introduced into the United States in the late 1800s as an aquarium plant.

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