Hieracium rigorosum (Laestadius ex Almquist) Almquist ex Omang
Hieracium rigorosum (Laestadius ex Almquist) Almquist ex Omang is a synonym sensu FNA Ed. Comm., 2006a of:
Hieracium umbellatum Linnaeus subsp. umbellatum, an accepted subspecies name sensu POWO.