20140090 Ver 3_Duckweed_20160610

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Wolffia
Wolffia beaker
Duckweed on a pond
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Types:
Duckweed is a member of the Lemnaceae family. Types of
duckweed include Landoltia, Lemna, Spirodela, Wolffia, and
Wolffiella.
Description:
Duckweed is a collective term that refers to a number of small
aquatic plants. Lemna has small roots and multiple leaves.
Wolffia, also called watermeal, is smaller with only one leaf and
no roots.
Habitat:
Duckweed can be found in quiet or slow moving freshwater
throughout North Carolina. They are more prevalent in warmer
months and die back when temperatures cool. Growths of
duckweed are easily moved about by wind or wave action and
often collect in coves and along shorelines.
Significance:
Duckweed is often considered to be an indicator of nutrient
enrichment (especially nitrate). Duckweed growths may
be considered unsightly but pose no known human or
environmental health risk.
North Carolina Division of Water Resources