| Kingdom | Plantae | Plants, but not fungi, lichens, or algae |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Liliopsida | Monocots (plants with a single seed leaf); includes the lily family |
| Subclass | Commelinidae | Dayflowers and spiderworts, and several others |
| Order | Cyperales | Flowering plants including grasses |
| Family | Poaceae | Grasses (but not sedges or rushes) |
| Genus | Bouteloua | Named after the brothers Claudio (1774-1842) and Estéban (1776-1813) Boutelou, Spanish botanists and horticulturists. Claudio was a professor of agriculture in Madrid and Esteban was possibly also |
| Species | rothrockii | After Dr. Joseph Trimble Rothrock (1839-1922), professor of botany at the University of Pennsylvania and surgeon on the Wheeler Exploring Expedition of 1873-1875 |
Bouteloua rothróckii
Bouteloua barbata Lag. var. rothrockii (Vasey) Gould
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ID is uncertain 
