The eastern tiger swallowtail butterfly Papilio glaucus L., is the most polyphagous of all swallowtails (Lepidoptera: Papilionidae) in the world (Scriber 1984). With a geographic range extending from Florida westward into Texas and north to the Brooks Mountain range in Alaska, and eastward across all of forested Canada, it may also have the largest distribution of any of 563 species of swallowtail butterflies in the world.
Scriber, J. Mark and Ayres, Matthew P.
"New Foodplant and Oviposition Records for the Tiger Swallowtail Butterfly, Papilio Glaucus Canadensis in Alaska (Lepidoptera: Papilionidae),"
The Great Lakes Entomologist: Vol. 23
, Article 4.
Available at: http://scholar.valpo.edu/tgle/vol23/iss3/4