Haplopappus carthamoides var. rigidus (Rydberg) M. Peck

Haplopappus carthamoides var. rigidus (Rydberg) M. Peck is a synonym sensu FNA Ed. Comm., 2006b of:

Pyrrocoma carthamoides Hooker var. carthamoides, an accepted variety name sensu FNA Ed. Comm., 2006b.