| T. wolfii |
| |
| 2. Inflorescence generally spike-like, dense, awns spreading, leaves generally basal, tufted |
| T. spicatum |
| 2' Inflorescence generally panicle-like, ± dense to open, awns generally ascending to erect, leaves basal and cauline |
| |
| 3. Lower inflorescence branches generally spreading, lower glume < 2 mm, upper glume tip irregularly 12-toothed |
| T. cernuum |
| 3' Lower inflorescence branches ascending to erect, lower glume 45 mm; upper glume acute |
| |
| 4. Spikelets green to tan, ligules generally > 1 mm, obtuse to truncate; inflorescence axis ± hairy |
| T. canescens |
| 4' Spikelets golden brown, ligules < 1 mm, ring-like; inflorescence axis glabrous |
| T. flavescens
|