Aster montanus var. giganteus (Hooker) Torrey & A. Gray
Aster montanus var. giganteus (Hooker) Torrey & A. Gray is a synonym sensu FNA Ed. Comm., 2006b of:
Eurybia sibirica (Linnaeus) G.L. Nesom, an accepted species name sensu FNA Ed. Comm., 2006b.