Piptatheropsis shoshoneana (Curto & Douglass M.Hend.) Romasch., P.M.Peterson & Soreng species accepted

Milium pungens Torr. species synonym

Piptatherum pungens (Torr. ex Spreng.) Roshev. species synonym

Oryzopsis micrantha (Trin. & Rupr.) Thurb. ex Porter & Coult. species synonym

Urachne canadensis Trin. & Rupr. species heterotypic synonym

Oryzopsis macounii (Scribn.) Beal species synonym

Oryzopsis juncea Britton, Sterns & Poggenb. species synonym

Milium pungens Torr. ex Spreng. species synonym

Oryzopsis canadensis (Poiret) Torrey species synonym

Stipa juncea Michx. species heterotypic synonym

Oryzopsis exigua var. exigua variety synonym

Piptatheropsis micrantha (Trin. & Rupr.) Romasch., P.M.Peterson & Soreng species accepted

Piptatheropsis exigua (Thurb.) Romasch., P.M.Peterson & Soreng species accepted

Piptatheropsis pungens (Torr. ex Spreng.) Romasch., P.M.Peterson & Soreng species accepted

Piptatheropsis canadensis (Poir.) Romasch., P.M.Peterson & Soreng species accepted

Stipa divaricata Columbus & J.P.Sm. species synonym

Stipa exigua (Thurb.) Columbus & J.P.Sm. species synonym

Stipa shoshoneana Curto & Douglass M.Hend. species synonym

Piptatherum shoshoneanum (Curto & Douglass M.Hend.) P.M.Peterson & Soreng species synonym

Oryzopsis parviflora Nutt. species synonym

Stipa macounii Scribn. species synonym

Panicum firmum Kunth species heterotypic synonym

Urachne micrantha Trin. & Rupr. species synonym

Urachne canadensis (Poir.) Torr. species heterotypic synonym

Urachne brevicaudata Trin. species synonym

Piptatherum exiguum (Thurb.) Dorn species synonym

Oryzopsis exigua Thurb. species synonym

Piptatherum canadense (Poir.) Dorn species synonym

Stipa canadensis Poir. species synonym

Oryzopsis canadensis (Poir.) Torr. ex A.Gray species synonym

Piptatherum micranthum (Trin. & Rupr.) Barkworth species synonym

Oryzopsis micrantha (Trin. & Rupr.) Thurb. species synonym

Piptatherum pungens (Torr. ex Spreng.) Dorn species synonym

Oryzopsis pungens (Torr. ex Spreng.) Hitchc. species synonym