| 1. | Spikelets (not including awns) c. 2 mm long, tightly arranged on inflorescence axis; awns less than 4 mm long | *P. indica (QLD) |
| Spikelets c. 4 mm long, loosely arranged on inflorescence axis; awns more than 10 mm long | 2 | |
| 2. | Glumes more or less scaberulous to setulose; leaf blades ±erect, rather flaccid, not distinctly distichous | P. rara (NSW NT SA WA QLD) |
| Glumes smooth, glabrous to shortly pubescent; leaf blades stiffly patent, distichous at short intervals | P. clarksonii (QLD) |
Key to Perotis derived from Vickery 1975; Veldkamp and van Steenbergen
1992
Taxonomic name: