MANUAL OF THE GRASSES OF THE UNITED STATES 957 



Eatonia pubescens Scribn. and Merr., U.S.Dept.Agr., Div. Agrost. Circ. 27: 6 

 1900. Starkville, Miss., Tracy. 



Eatonia robusta Rydb., Bull. Torrey Bot. Club 32: 602. 1905. Based on E. 

 obtusata var. robusta Vasey. 



Sphenopholis obtusata lobata Scribn., Rhodora 8: 144. 1906. Based on Tri* 

 setum lobatum Trin. 



Sphenopholis obtusata pubescens Scribn., Rhodora 8: 144. 1906. Based on 

 Eatonia pubescens Scribn. and Merr. 



Eatonia annua Suksdorf, West. Amer. Sci. 15: 50. 1906. Dalles on Columbia 

 River, Oreg., Suksdorf 1553. [Plants depauperate, flowering first year.] 



Sphenopholis obtusata var. pubescens Scribn.; Robinson, Rhodora 10: 65. 

 1908. Based on Eatonia pubescens Scribn. and Merr. 



Sphenopholis obtusata var. lobata Scribn.; Robinson, Rhodora 10: 65. 1908. 

 Based on Trisetum lobatum Trin. 



Sphenopholis annua Heller, Muhlenbergia 6: 12. 1910. Based on Eatonia 

 annua Suksdorf. 



Sphenopholis pubescens Heller, Muhlenbergia 6: 12. 1910. Based on Eatonia 

 pubescens Scribn. and Merr. 



Sphenopholis robusta Heller, Muhlenbergia 6: 12. 1910. Based on Eatonia 

 obtusata var. robusta Vasey. 



Reboulea obtusata var. lobata Farwell, Mich. Acad. Sci. Rept. 17: 182. 1916. 

 Based on Trisetum lobatum Trin. 



Reboulea obtusata var. pubescens Farwell, Mich. Acad. Sci. Rept. 17: 181. 1916. 



Based on Eatonia pubescens Scribn. and Merr. 



(6) Sphenopholis pallens (Spreng.) Scribn., Rhodora 8: 145. 1906. Based on 

 Aira pallens Spreng. 



Aira pa Wens Spreng., Mant. Fl. Hal. 33. 1807. Pennsylvania, Muhlenberg. 



Aira pallens Muhl., Descr. Gram. 84. 1817. No locality cited. Aira 

 pennsylvanica Spreng., erroneously given as synonym, Muhlenberg's descrip- 

 tion agreeing with that of A. pallens Spreng., not with that of A. pennsyl- 

 vanica Spreng. 



Eatonia aristata Scribn. and Merr., U.S.Dept.Agr., Div. Agrost. Circ. 27: 7. 

 1900. South Carolina, Curtiss in 1876. 



Eatonia pallens Scribn. and Merr., U.S.Dept.Agr., Div. Agrost. Circ. 27: 7. 

 1900. Based on Aira pallens Spreng. 



Trisetum aristatum Nash, in Small, Fl. Southeast. U.S. 130. 1903. Presum- 

 ably based on Eatonia aristata Scribn. and Merr. 



Sphenopholis aristata Heller, Muhlenbergia 6: 12. 1910. Based on Eatonia 

 aristata Scribn. and Merr. 



Reboulea pallens Farwell, Mich. Acad. Sci. Rept. 17: 181. 1916. Based on 

 Aira pallens Spreng. 



(76) SPOROBOLUS R. Br. 



(26) Sporobolus airoides (Torr.) Torr., U.S. Rept. Expl. Miss. Pacif. 7: 21. 



1856. Based on Agrostis airoides Torr. 

 Agrostis airoides Torr., Ann. Lye. N.Y. 1: 151. 1824. Branches of the 



Arkansas River near the Rocky Mountains, James. 

 Vilfa airoides Trin.; Steud., Nom. Bot. ed. 2. 2: 766. 1841. Based on 



Agrostis airoides Torr. 

 Sporobolus diffusissimus Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 90. 1863. 



Western Texas [Wright 726]. 

 (18) Sporobolus argutus (Nees) Kunth, Re*v. Gram. 1: Sup. XVII. 1830. Based 



on Vilfa arguta Nees. 



Vilfa arguta Nees, Agrost. Bras. 395. 1829. Brazil. 

 Vilfa arkansana Trin., Mem. Acad. St. Petersb. VI. Sci. Nat. 4 1 : 64. 1840. 



Arkansas, Beyrich. 

 Vilfa subpyramidata Trin., Me"m. Acad. St. Pe"tersb. VI. Sci. Nat. 4: 61. 



1840. Texas [received from Hooker, the type being Drummond 377]. 

 Vilfa richardi Steud., Syn. PL Glum. 1: 153. 1854. West Indies. 

 Agrostis pyramidalis Rich.; Steud., Syn. PL Glum. 1: 153. 1854, as synonym 



of Vilfa richardi Steud. 

 Vilfa agrostoidea Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 88. 1863. Llano 



County, Tex. 

 Vilfa sabeana Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 90. 1863. San Saba 



County, Tex., Buckley. Given as Vilfa (Sporobolus) sabeana. 

 Sporobolus arkansanus Nutt.; Vasey, Contrib. U.S. Natl. Herb. 3: 61. 1892, 



as synonym of S. argutus Kunth. 



