Alismatidae

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.

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

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

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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