| 1. | Racemes slender, 2-3 mm wide | A. elymoides (NSW NT WA QLD) |
| Racemes thicker, 5-13 mm wide | 2 | |
| 2. | Lemma with three hooked hairs | A. squarrosa (NSW NT SA WA QLD) |
| Lemma with one straight awn | 3 | |
| 3. | Glumes shorter than spikelets; spikelets densely overlapping | A. pectinata (NSW NT SA WA QLD) |
| Glumes as long as spikelet; spikelets loosely overlapping | A. lappacea (NSW NT SA WA QLD) A. triticoides |
Key to Astrebla derived from Lazarides 1972; Nightingale et al 2005
Taxonomic name: