The larva of the black swallowtail butterfly, Papilio polyxenes asterius, which is a pest of plants of the family Apiaceae (Umbelliferae) in eastern North America.
Origin
Mid 19th century.
Definition of parsleyworm in US English:
parsleyworm
noun
US
The larva of the black swallowtail butterfly, Papilio polyxenes asterius, which is a pest of plants of the family Apiaceae (Umbelliferae) in eastern North America.