1. Inflorescence dense and spike-like *A. praecox (NSW VIC TAS WA)
Inflorescence open and spreading 2

2. Pedicels 3-8 times spikelet length 3
Pedicels up to 3 times spikelet length 4

3. Spikelets 2.5-3.5 mm long *A. provincialis (NSW)
Spikelets 1.5-2.5 mm long *A. elegantissima (NSW VIC TAS SA WA)
A. elegans

4. Spikelets 2-2.5 mm long; leaves scattered along culm
*A. cupaniana (NSW VIC SA WA QLD)
Spikelets 2.3-3.5 mm long; leaves mostly basal
*A. caryophyllea (NSW VIC TAS SA WA QLD)

Key to Aira derived from Tutin 1980; Wheeler, Jacobs & Norton 1982; Weiller, Kodela & Thompson 2009.

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