| 1. | Spikelets 2 ranked in lower part of inflorescence |
*T. uniolae (VIC WA) Plagiochloa uniolae |
| Spikelets arranged all round central axis | 2 | |
| 2. | Plants annual; glumes and lemmas acuminate to awned | *T. echinatum (WA) Lasiochloa echinata |
| Plants perennial; glumes and lemmas acute | 3 | |
| 3. | Hairs on lemma club-shaped | *T. acutiflorum (VIC SA) Desmazeria acutiflora, Plagiochloa acutiflora |
| Hairs on lemma not club-shaped | *T. obliterum (SA VIC WA) |
Key to Tribolium derived from Renvoize 1985; Linder and Davidse
1997
Taxonomic name: