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Definition of Spirodela polyrrhiza
1. Noun. Cosmopolitan except South America and New Zealand and some oceanic islands.
Exact synonyms: Great Duckweed, Water Flaxseed
Generic synonyms: Duckweed
Group relationships: Genus Spirodela, Spirodela
Generic synonyms: Duckweed
Group relationships: Genus Spirodela, Spirodela