1. Lemmas hairy E. gulliveri (QLD)
E. gulliveri var. squarrulosa
Lemmas not hairy 2

2. Spikelets 14-30mm long (excluding awns);
lowest lemma
4-7mm long
Spikelets 2-11(-14)mm long (excluding
awns); lowest lemma 1.5-4mm long

3. Spikelets 25-30mm long E. blakei (NT QLD)
Spikelets 14-20mm long 4

4. Spikelets appressed to inflorescence
E. danesii (NT WA QLD)
E. appressa
Spikelets laxly dispersed E. laxa (NT QLD)

5. Lemmas distinctly scabrid all over E. scabrida (NT WA QLD)
Lemmas smooth or slightly scabrous 6

6. Spikelets 2-4mm wide 7
Spikelets 0.5-1.5mm wide 8

7. Lemmas narrowly acuminate to aristate E. anomala (QLD)
Lemmas with a distinct awn at least 2mm
E. confusa (NT QLD)

8. Florets 8-25, all similar, mainly bisexual;
awns 0.5-1.5mm long
E. lasioclada (NT WA QLD)
E. eragrostoides, E. subaristata,
Ectrosiopsis lasioclada
Florets 2-9, lower bisexual or male, upper
sterile; awns up to 12mm long

9. Lowest lemma 3-3.5mm long 10
Lowest lemma 1.5-3mm long 11

10. Perennial E. schultzii var. schultzii (NT WA QLD)
Annual E. schultzii var. annua (NT QLD)

11. Spikelets 2-3mm long; inflorescence
E. agrostoides (NT WA QLD)
Spikelets 3-7mm long; inflorescence
E. leporina (NT WA QLD)
E. leporina var. longiglumis, E.
var. micrantha, E. leporina var. pauciflora, E. leporina
var. spadicea

Key to Ectrosia derived from Hubbard 1936; Nightingale & Weiller 2005

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