plural noun
Apet·a·lae | \ (ˈ)āˈpetᵊlˌē \

Definition of Apetalae 

in some classifications

: a group of the Archichlamydeae comprising plants whose flowers have no petals — compare choripetalae

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History and Etymology for Apetalae

New Latin, from a- entry 2 + -petalae

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