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Species
Information
- South
American Waterweed (Brazilian waterweed)
- Egeria
densa Planch.
= Elodea densa (Planch.) Caspary
- USDA
Symbol: EGDE
- Oregon
Noxious Weed Designation: B
- Pictures
Identification: Perennial aquatic herb. Leaves 1-3 cm long, up to 5mm broad, and in whorls of 4 to 8. Leaves linear and short internodes give it a very leafy appearance. Leaves and stems generally bright green. Stems erect, simple or branched and grow until they reach water's surface where they form dense mats. Flowers small, white, have three petals, and float on or rise above the water's surface on thread-like appendages. Adventitious roots freely produced from double nodes on the stem.
Impacts: South American waterweed aggressively invades new aquatic environments, displacing native vegetation by forming dense stands or large subsurface mats and altering the dynamics of the aquatic ecosystem. It also impedes flows in waterways, increases flooding, clogs pumps and boat propellers, and limits use of waterways for recreation.
Biological
Controls: No approved biological control agent is available.
Oregon
Maps of South American Waterweed Distribution
Links:
USDA
Plants Database information on South American waterweed
GRIN
Database information on South American waterweed
Oregon Department
of Agriculture information on South American waterweed
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