The Columbia Encyclopedia, Sixth Edition. Columbia Encyclopedia World Factbook Columbia Gazetteer American Heritage Coll.
Duckweeds are tiny floating or submerged aquatic plants with reduced or obsolete roots.
They flower only rarely, and their flowers are small and inconspicuous. Duckweeds grow in freshwater throughout most of the world. They are classified in the division Magnoliophyta , class Liliopsida, order Arales, family Lemnaceae. The Columbia Encyclopedia, Sixth Edition. Click here to shop the Bartleby Bookstore .