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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 (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 [https://web.archive.org/web/20070927000050/http://www.accessscience.com/Encyclopedia/0/02/Est_022600_frameset.html?doi 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.

    Category:Monocots