Achnatherum occidentale (Thurb. ex S. Watson) Barkworth ssp. californicum (Merr. & Burtt Davy) Barkworth
Publication: Phytologia 74(1): 10. 1993.
Achnatherum nelsonii (Scribn.) Barkworth ssp. longiaristatum (Barkworth & J. Maze) Barkworth
Stipa californica Merr. & Burtt Davy
Stipa nelsonii Scribn. var. longiaristata Barkworth & J. Maze
Stipa occidentalis Thurb. ex S. Watson var. californica (Merr. & Burtt Davy) C.L. Hitchc. [HC]