| mexico | | bouteloua barbata | species | 10 | 0 |
| mexico | | bouteloua barbata var. rothrockii | varietas | 6 | 0 |
| mexico | | bouteloua barbata var. sonorae | varietas | 1 | 0 |
| united states | | bouteloua barbata | species | 3 | 0 |
| united states | | bouteloua barbata var. barbata | varietas | 3 | 0 |
| united states | | bouteloua barbata var. rothrockii | varietas | 9 | 0 |