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Mary E. Barkworth +
(Scribn.) Barkworth +
Nelson's needlegrass +
Ariz. +, Colo. +, N.Mex. +, Tex. +, Utah +, Calif. +, Oreg. +, Mont. +, Wyo. +, Wash. +, Alta. +, B.C. +, Sask. +, Yukon +, Nev. +, Idaho +  and S.Dak. +
Stipa columbiana var. nelsonii +
Achnatherum nelsonii subsp. nelsonii +
Achnatherum nelsonii +
subspecies +