| Cohniella Pfitzer, 1889 |
| Cohniella ascendens (Lindl.) Christenson, 1999 |
| Cohniella biorbicularis Balam & Cetzal, 2010 |
| Cohniella brachyphylla (Lindl.) Cetzal & Carnevali, 2010 |
| Cohniella cebolleta (Jacq.) Christenson, 1999 |
| Cohniella leptotifolia Cetzal & Carnevali, 2010 |
| Cohniella longifolia (Lindl.) Cetzal & Carnevali, 2010 |
| Cohniella pendula Carnevali & Cetzal, 2010 |
| Cohniella yucatanensis Cetzal & Carnevali, 2010 |
| Coilostylis Raf., 1838 |
| Coilostylis ciliaris (L.) Withner & P.A. Harding, 2004 |
| Coilostylis cuspidata (G. Lodd.) Withner & P.A. Harding, 2004 |
| Coilostylis emarginata Raf., 1838 |
| Coilostylis falcata (Lindl.) Withner & P.A. Harding, 2004 |
| Coilostylis lacertina (Lindl.) Withner & P.A. Harding, 2004 |
| Coilostylis parkinsoniana (Hook.) Withner & P.A. Harding, 2004 |
| Coilostylis pugioniformis (Regel) D.P. Banks, 2004 |
| Collabieae Pfitzer, 1887 |
| Comparettia Poepp. & Endl., 1836 |
| Comparettia cryptocera C. Morren, 1852 |