Spirodela polyrrhiza (L.) Schleid.  
Family: Araceae
giant duckweed, greater duckweed
[Lemna polyrrhiza L., Spirodela polyrrhiza var. masonii (L.) Schleid.]
Spirodela polyrrhiza image
Linda Ellis  
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
Spirodela polyrrhiza image
John Kohout  
Spirodela polyrrhiza image
Spirodela polyrrhiza image
Paul Skawinski  
Spirodela polyrrhiza image
Elizabeth H. Zimmerman  
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