Comprises about 500 species in 14 families of aquatic and semi-aquatic herbs

• One of four subclasses or superorders of Monocotyledones

Wikipedia Word definitions in Wikipedia
Alismatidae is a botanical name at the rank of subclass . Circumscription of the subclass will vary with the taxonomic system being used (there are many such systems ); the only requirement being that it includes the family Alismataceae . It is a relatively ...