| 1 | Inflorescence an elongate, narrow, oblanceolate, spike-like panicle |
| 1' | Inflorescence an ellipsoid panicle or capitulum of spikes |
| 2 | Inflorescence longer than broad |
| 2' | Inflorescence broader than long |
| 3 | Glumes without cuspidate acumen; lemmas 3.0-3.6 mm long, acute, unawned |
| 3' | Glumes narrowing into a cuspidate acumen; lemmas 2.5-3.0 mm long, ending into a cuspidate acumen of 0.5-0.8 mm |
| 4 | Spikelets 4-6 x 1 mm; stamens 3 |
| 4' | Spikelets 3.0-3.5 x 1.0-1.5 mm; stamens 2 |
