Synonyms
Achnatherum nelsonii subsp. longiaristatum (Barkworth & J.R.Maze) Barkworth
Achnatherum occidentale subsp. californicum (Merr. & Burtt Davy) Barkworth
Stipa occidentalis var. californica (Merr. & Burtt Davy) C.L.Hitchc.
Stipa nelsonii var. longiaristata Barkworth & J.R.Maze