| 1. | Tall robust plant to 2 m tall with a fulvous, fibrous base | E. mackinlayi (NT WA QLD) |
| Plant less than 1.5 m tall; base not fulvous or fibrous |
2 | |
| 2. | Racemes more than 5, with pale brown hairs | E. trispicata (QLD) |
| Racemes less than 5, with dark brown hairs | 3 | |
|
3.
4.
5. |
Spikelets c. 5 mm long | 4 |
| Spikelets 2.5-3 mm long | 6 | |
| Rhizomes elongated (to 6 cm long); racemes remaining closed at maturity, with brown hairs | E. sp. (Three Rivers Station, B.Forsyth AQ6789133) | |
| Rhizomes absent or very short; racemes opening up at maturity | 5 | |
| Racemes with brown hairs | E. aurea (NSW VIC NT SA WA QLD) E. fulva |
|
| Racemes with white hairs | E. sp. (Jindy, JMR-MM 140) |
|
| 6. | Perennial | E. sp. A (Sabai Island J.R.Clarkson 7801)(QLD) |
| Decumbent to weakly tufted annual | E. annua (NT WA QLD) |
Key to Eulalia derived from Tothill and Hacker 1983; Simon 1989b
Taxonomic name: