• WordNet 3.6
    • n Lemna minute aquatic herbs floating on or below the water surface of still water consisting of a leaflike frond or plant body and single root
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Century Dictionary and Cyclopedia
    • n lemna A genus of monocotyle donous plants, type of the order Lemnaceæ. It is distinguished from Wolffia, the only other genus of the order, by having the flowers developed on the margin of the frond instead of from a pit in the upper surface. Distributed about the temperate and tropical regions of the world are seven species, known as duckweed, some of them the smallest of flowering plants, consisting of a frond that floats on the surface of the water, and bears below a few thread-like roots, and above one or more monœcious flowers.
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In literature:

Lemna, Valisneria, Azolla, AEsculus asamicus in abundance.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Three species are reported from Michigan, of which the commonest is Lemna minor.
"The Plants of Michigan" by Henry Allan Gleason
DUCKWEED, the popular name of several species of Lemna, nat.
"The New Gresham Encyclopedia" by Various

In news:

Since 1990, the Lemna Wastewater Facility has helped announce the season with the scent of sewage.