Achnatherum nelsonii subsp. nelsonii

Common names: Nelson's needlegrass
Synonyms: Stipa columbiana var. nelsonii
Treatment appears in FNA Volume 24. Treatment on page 124.

Calluses sharp, acute to acuminate, glabrous tips 0.05-0.15 mm, dorsal boundary of the glabrous tip and the callus hairs acute; awns 19-45 mm.

Discussion

Achnatherum nelsonii subsp. nelsonii intergrades with subsp. dorei in Montana and Wyoming, and with A. occidentale subsp. pubescens in California. Its range extends from Idaho and Montana south to Nevada. It tends to grow at lower elevations than subsp. dorei.

Selected References

None.

Lower Taxa

None.

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 +