1) Class 2) Subclass arecidae 
Arecidae 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 Arecaceae. ==Arecidae in the Takhtajan system== The Takhtajan system used this name for a subclass in the class Liliopsida (=monoc...
(from the article `angiosperm`) ...mycotrophic Alismatidae, without chlorophyll (unique in the subclass). Two families: Petrosaviaceae and Triuridaceae.Subclass ArecidaeA loose ...
[n] - one of four subclasses or superorder of Monocotyledones
subclass Arecidae noun one of four subclasses or superorder of Monocotyledones; comprises about 6400 species in 5 families of trees and shrubs and terrestrial herbs and a few free-floating aquatics including: Palmae; Araceae; Pandanaceae and Le...