Subject
- Specific Epithet: canescens 3
- Specific Epithet: capillaceum 4
- Specific Epithet: capillare 14
- Specific Epithet: capillifolium 26
- Specific Epithet: cavifolium 43
- Specific Epithet: centrale 6
- Specific Epithet: cerviculata 1
- Specific Epithet: chryseum 1
- Specific Epithet: chrysophyllum 23
- Specific Epithet: ciliare 2
- Specific Epithet: ciliaris 3
- Specific Epithet: ciliata 10
- Specific Epithet: cinclidioides 3
- Specific Epithet: cirrosum 1
- Specific Epithet: cladorrhizans 14
- Specific Epithet: clypeata 4
- Specific Epithet: coarctata 2
- Specific Epithet: cohaerens 3
- Specific Epithet: collinum 1
- Specific Epithet: commune 9