1. Sterile lemmas glabrous 2
Sterile lemmas with silky hairs 3

2. Spikelets 3-5mm long, sterile lemmas obtuse *E. erecta (NSW VIC TAS SA WA QLD)
Spikelets more than 10mm long, sterile lemmas ending in awn-like points *E. longiflora (NSW VIC TAS SA WA QLD)

3. Spikelets more than 9mm long *E. villosa (NSW)
Spikelets less than 7mm long 4

4. Sterile lemmas ending in awn-like points *E. pusilla (WA)
Sterile lemmas acute or obtuse 5

5. Perennial; sterile lemmas subequal *E. calycina (NSW VIC TAS SA WA)
Annual; upper sterile lemma more than twice length of lower lemma 6

6. Spikelets 3-3.5mm long *E. brevifolia var. brevifolia (WA)
Spikelets 4-4.5mm *E. brevifolia var. cuspidata (WA)

Key to Ehrharta derived from Gardner 1952; Vickery 1975

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