Artemisia arbuscula var. longiloba (Osterh.) Dorn accepted as Artemisia arbuscula subsp. longiloba (Osterh.) L.M.Shultz (original description)
Artemisia biennis var. diffusa Dorn accepted as Artemisia biennis Willd. (original description)
Artemisia tripartita subsp. tripartita var. rupicola (Beetle) Dorn (original description)
Cirsium tioganum var. coloradense (Rydb.) Dorn accepted as Cirsium scariosum var. coloradense (Rydb.) D.J.Keil (original description)
Cirsium tioganum var. coloradensis (Rydb.) Dorn (original description)
Erigeron pumilus var. concinnus (Hook. & Arn.) Dorn accepted as Erigeron concinnus (Hook. & Arn.) Torr. & A.Gray (original description)
Haplopappus coloradoensis (A.Gray) R.L.Hartm. ex Dorn accepted as Xanthisma coloradoense (A.Gray) D.R.Morgan & R.L.Hartm. (original description)
Heterotheca depressa (Rydb. ex Rydb.) Dorn accepted as Heterotheca villosa var. depressa (Rydb.) Semple (original description)
Machaeranthera canescens var. monticola Dorn (original description)
Senecio werneriifolius var. alpinus (A.Gray) Dorn (original description)
Townsendia condensata var. anomala (Heiser) Dorn accepted as Townsendia condensata Parry ex Parry (original description)