Alismatidae

From Wikipedia, the free encyclopedia

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:

  • subclass Alismatidae
    superorder Alismatanae
    order Butomales
    order Hydrocharitales
    order Najadales
    order Alismatales
    order Aponogetonales
    order Juncaginales
    order Potamogetonales
    order Posidoniales
    order Cymodoceales
    order Zosterales

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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