Lemmon's Needlegrass: Eriocoma lemmonii ssp. lemmonii (Synonyms: Achnatherum lemmonii ssp. lemmonii, Stipa columbiana, Stipa columbiana var. columbiana, Stipa lemmonii var. jonesii, Stipa lemmonii var. lemmonii)
Dore's Needlegrass, Nelson's Needlegrass: Eriocoma nelsonii ssp. dorei (Synonyms: Achnatherum nelsonii ssp. dorei, Stipa nelsonii var. dorei)
Nelson's Needlegrass: Eriocoma nelsonii ssp. nelsonii (Synonyms: Achnatherum nelsonii ssp. nelsonii, Stipa columbiana var. nelsonii, Stipa occidentalis, Stipa occidentalis var. nelsonii, Stipa williamsii)
California Needlegrass: Eriocoma occidentalis ssp. californica (Synonyms: Achnatherum nelsonii ssp. longiaristatum, Achnatherum occidentale ssp. californicum, Stipa californica, Stipa occidentalis var. californica)