Arnica tomentosa J.M. Macoun ex Greene nom. illeg.

Arnica tomentosa J.M. Macoun ex Greene nom. illeg. is a synonym sensu Downie & Denford, 1988 of:

Arnica angustifolia subsp. tomentosa (J.M. Macoun) G.W. Douglas & Ruyle-Douglas, an accepted subspecies name sensu FNA Ed. Comm., 2006c.