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). (wikipedia.org)
Alismatales1
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). (wikipedia.org)
Members1
Hydrocharitaceae, like other members of the Alismatidae, have one or more (fewer than 20) scales (intravaginal squamules) in the axils of their leaves. (asu.edu)
Liliopsida2
A plant genus of the family Posidoniaceae, subclass ALISMATIDAE , class Liliopsida (monocotyledons). (nih.gov)
A plant genus of the family Ruppiaceae, subclass ALISMATIDAE , class Liliopsida (monocotyledons). (nih.gov)
Subclass1
Alismatidae is a botanical name at the rank of subclass. (wikipedia.org)