| 1. |
Spikelets usually 1.35–1.5 mm long. Panicle usually effuse and open, 20–50 × 6–30 cm. |
C. accrescens (QLD) |
|
Spikelets longer than 1.5 mm long. Panicle open to contracted, 3-18 x 0.8-3 cm |
2 | |
| 2. | Spikelets with tubercle-based hairs | C. capitis-york (QLD) |
| Spikelets glabrous | 3 | |
|
3.
4. |
Upper glume shorter than the spikelet, 5-nerved | C. patens (QLD) |
| Upper glume as long as the spikelet, 3-nerved |
4 |
|
| Panicle usually with many spikelets, branches usually pilose, at least below the spikelet | C. oxyphyllum (QLD) | |
| Panicle usually with few spikelets, branches glabrous. | C. trigonum (QLD) |
Key to Cyrtococcum derived from Webster 1987, Simon 1992c, Simon 2010, Veldkamp ms.
Taxonomic name: