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1. |
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| Inflorescence a large compound terminal panicle of many racemes | *S.microstachyum (QLD) | |
| Inflorescence composed of simple axillary and terminal racemes | 2 | |
| 2. |
Racemes concealed within spatheoles; ligules at least 2 mm long | S. mitchelliana (WA) |
| Racemes projected beyond spatheoles; ligules to 1mm long | 3 |
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| 3. |
Sessile spikelets dorsally compressed, 4-8 times as long as wide | 4 |
| Sessile spikelets ±laterally compressed, 7-13 times as long as wide | 7 |
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| 4. | Lower glume of sessile spikelet not winged | S. pseudeulalia (NT WA QLD) |
| Lower glume of sessile spikelet winged, at least above middle | 5 |
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| 5. | Rachis internode with a dense oblique beard of long hairs | S. fragile (NSW NT WA QLD) S. obliqueberbe |
| Rachis internode glabrous or diffusely hairy | 6 | |
| 6. | Spikelets 3.5-4.5 mm long, 0.6-0.7 mm wide | S. perplexum (NT QLD) |
| Spikelets 5-8 mm long, 1.3-1.6 mm wide | S. pachyarthron (NT WA QLD) | |
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7.
8. |
Rachis internodes and pedicels very slender with a dense ±horizontal band of long hairs above middle |
S. crinizonatum (NT WA QLD) |
| Rachis internodes and pedicels ±stout, with hairs diffuse or marginal and not in a horizontal band |
8 | |
| Sessile spikelet similar to pedicel in appearance, with a glabrous upper lemma |
S. occultum (NT QLD) | |
| Sessile spikelet very different to pedicel in appearance, with a ciliolate upper lemma |
S. dolosum (QLD) |