Eriocoma nelsonii (Scribn.) Romasch., comb. nov.

Peterson, Paul M., Romaschenko, Konstantin, Soreng, Robert J. & Reyna, Jesus Valdes, 2019, A key to the North American genera of Stipeae (Poaceae, Pooideae) with descriptions and taxonomic names for species of Eriocoma, Neotrinia, Oloptum, and five new genera: Barkworthia, x Eriosella, Pseudoeriocoma, Ptilagrostiella, and Thorneochloa, PhytoKeys 126, pp. 89-125 : 96

Eriocoma nelsonii (Scribn.) Romasch., comb. nov.

Stipa nelsonii Scribn., Bull. Div. Agrostol., U.S.D.A. 11: 46. 1898 [Basionym] ≡ Stipa columbiana var. nelsonii (Scribn.) Hitchc., Contr. U.S. Natl. Herb. 24(7): 254. 1925 ≡ Stipa columbiana var. nelsonii (Scribn.) H. St. John, Fl. S.-E. Washington 61. 1937 ≡ Stipa occidentalis var. nelsonii (Scribn.) C.L. Hitchc., Vasc. Pl. Pacific NW 1: 715. 1969 ≡ Achnatherum nelsonii (Scribn.) Barkworth, Phytologia 74(1): 9. 1993. Type: USA, Wyoming, Albany Co., Woods Landing, 2600 m, 9 Aug 1898, A. Nelson 3963 (lectotype: US-556901! designated by Barkworth, Phytologia 74(1): 9. 1993; isolectotype: MPU-026968 [image!]).

Eriocoma nelsonii = Stipa williamsii Scribn., Bull. Div. Agrostol., U.S.D.A. 11: 45-46, t. 4. 1898. Type: USA, Wyoming, dry soil on W side of Big Horn Mt., near Monument Spring, 2200-2400 m, 3 Aug 1897, T.A. Williams 2804 (lectotype: US-556907! & US-00141714 [image!] designated here, partially lectotypified by Hitchcock, N. Amer. Fl., part 6. 422. 1935).