Lemna perpusilla Torr.
Family: Araceae
least duckweed,  more...
[Lemna perpusilla var. trinervis Torr.,  more]
Lemna perpusilla image
from USDA Plants website  
Etymology: Lemna: from Greek limnos, "lake or swamp," referring to its aquatic habitat
Plants: perennial aquatic
Conservation Status: Native
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