Definition of Alismatidae
1. Noun. One of four subclasses or superorders of Monocotyledones; comprises about 500 species in 14 families of aquatic and semiaquatic herbs.
Generic synonyms: Class
Group relationships: Class Liliopsida, Class Monocotyledonae, Class Monocotyledones, Liliopsida, Monocotyledonae, Monocotyledones
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