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Alismatidae (n.)
1.one of four subclasses or superorders of Monocotyledones; comprises about 500 species in 14 families of aquatic and semiaquatic herbs
2.(MeSH)A plant subclass of the class Liliopsida (monocotyledons) in the Chronquist classification system. This is equivalent to the Alismatales order in the APG classification system. It is a primitive group of more or less aquatic plants.;A plant genus of the family Najadaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).;A plant genus of the family Posidoniaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).;A plant genus of the family Ruppiaceae, subclass ALISMATIDAE, class Liliopsida (monocotyledons).
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Alismatidae (n.)
Alismatidae (n.) (MeSH)
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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 new name: earlier systems, such as the Engler and Wettstein systems, used the name Helobiae for a comparable unit.
The Takhtajan system treats this as one of six subclasses within the class Liliopsida (=monocotyledons). It consists of:
The Cronquist system treats this as one of four subclasses within the class Liliopsida (=monocotyledons). It consists of (1981):
This subclass comprises less than five hundred species total: many of these are aquatic or semiaquatic plants (see Alismatidae info).
The APG II system does not use formal botanical names above the rank of order; it assigns most of the plants involved to the (expanded) order Alismatales, in the clade 'monocots', although the plants in Cronquist's order Triuridales are assigned to quite different placements.
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