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Alismatidae

Alismatidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used ; 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.

Alismatidae in the Takhtajan system
The Takhtajan system treats this as one of six subclasses within the class Liliopsida (=monocotyledons). It consists of: • subclass Alismatidae • : superorder Alismatanae • :: order Butomales • :: order Hydrocharitales • :: order Najadales • :: order Alismatales • :: order Aponogetonales • :: order Juncaginales • :: order Potamogetonales • :: order Posidoniales • :: order Cymodoceales • :: order Zosterales ==Alismatidae in the Cronquist system==
Alismatidae in the Cronquist system
The Cronquist system treats this as one of four subclasses within the class Liliopsida (=monocotyledons). It consists of (1981): • subclass Alismatidae • : order Alismatales • : order Hydrocharitales • : order Najadales • : order Triuridales This subclass comprises less than five hundred species total: many of these are aquatic or semiaquatic plants (see Alismatidae info). ==APG II system==
APG II system
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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