Subject
- Specific Epithet: compacta 3
- Specific Epithet: compactum 6
- Specific Epithet: complanata 3
- Specific Epithet: condensatum 7
- Specific Epithet: confervoides 3
- Specific Epithet: conicum 11
- Specific Epithet: conjugata 8
- Specific Epithet: controversa 12
- Specific Epithet: convoluta 2
- Specific Epithet: cordifolium 9
- Specific Epithet: crassinervium 10
- Specific Epithet: crenuliformis 2
- Specific Epithet: crispa 14
- Specific Epithet: crispata 20
- Specific Epithet: crispula 1
- Specific Epithet: crispum 7
- Specific Epithet: crista-castrensis 2
- Specific Epithet: cristatus 28
- Specific Epithet: cristula 3
- Specific Epithet: cumberlandianum 7