Arnica angustifolia A.Gray accepted as Arnica parryi A.Gray (original description)
Artemisia richardsoniana A.Gray accepted as Artemisia norvegica Fr. (original description)
Boltonia latisquama A.Gray accepted as Boltonia asteroides var. latisquama (A.Gray) Cronquist (original description)
Haplopappus parryi A.Gray accepted as Oreochrysum parryi (A.Gray) Rydb. (original description)
Haplopappus pygmaeus (Torr. & A.Gray) A.Gray accepted as Tonestus pygmaeus (Torr. & A.Gray) A.Nelson (original description)
Senecio cernuus A.Gray accepted as Senecio pudicus Greene (original description)
Senecio integerrimus A.Gray (original description)