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

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith