Spirodela polyrrhiza (L.) Schleid.
Family: Araceae
giant duckweed, greater duckweed
Spirodela polyrrhiza image
Etymology: Spirodela: from Greek speira, "a cord," and delos, "evident," meaning "visible thread" and referring to the roots
Plants: floating perennial aquatic, clusters of several lobed leaves; stems none; 5-15 roots per leaf frond
Leaves: irregular oval, green above, dark red below
Fruits: reproduces by budding; new leaves staying attached to clump
Habitat: wet; ponds, lakes
Conservation Status: Native