| 1. | Flowering culm less than 25 cm tall | A. grevillensis (QLD) |
| Flowering culm more than 40 cm tall | 2 | |
| 2. | Culms up to 9-noded, covered by leaf sheaths; leaf blades to 2 mm wide | A. montana (QLD) |
| Culms 3-5-noded, internodes exposed; leaf blades to 7 mm wide | 3 | |
| 3. | Fertile lemma 3-awned | A. setosa (NT QLD) |
| Fertile lemma 1-awned | A. nepalensis (NSW NT WA QLD) |
Key to Arundinella derived from Simon 1982b