| C. vaginiflora |
| 1' Sheath margins glabrous |
| |
| 2. Inflorescence length 78 × > width; inflorescence stalk > 1 cm, exserted from subtending sheath |
| C. alopecuroides |
| 2' Inflorescence length < 5 × > width; inflorescence stalk < 1 cm, inflorescence partly enclosed by subtending sheath |
| C. schoenoides
|