Bouteloua barbata var. rothrockii (Vasey) Gould in Ann. Missouri Bot. Gard. 66(3): 403. 1980 ["1979"] sec. Dávila & al. 2018
- =Bouteloua polystachya var. major Vasey in Rep. U.S. Geogr. Surv., Wheeler 6: 287. 1878 syn. sec. ???
- =Bouteloua rothrockii Vasey in Contr. U.S. Natl. Herb. 1(8): 268. 1893 syn. sec. ???
- =Bouteloua barbata var. major (Vasey) Govaerts, World Checkl. Seed Pl. 2(1): 13. 1996 syn. sec. ???