Synonyms
Helianthus giganteus var. utahensis D.C.Eaton
Helianthus californicus Nutt. ex Torr. & A.Gray
Helianthus coloradensis f. sulphurea Cockerell
Helianthus parishii var. coloradensis (Cockerell) Cockerell
Helianthus californicus var. utahensis (D.C.Eaton) A.Gray
Helianthus nuttallii f. verticillatus B.Boivin
Helianthus subtuberosus f. verticillatus B.Boivin
Helianthus utahensis (D.C.Eaton) A.Nelson
Helianthus giganteus f. verticillatus Lakela
Helianthus coloradensis Cockerell
Helianthus fascicularis Greene
Helianthus nuttallii subsp. canadensis R.W.Long
Helianthus nuttallii subsp. coloradensis (Cockerell) R.W.Long