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Genus Callistephus
- one species: erect Asiatic herb with large flowers
Genus Carduus
- genus of annual or perennial Old World prickly thistles
Genus Carlina
- genus of Mediterranean thistles
Genus Catananche
- genus of Mediterranean herbs: cupid's dart
Genus Chamaemelum
- small genus of plants sometimes included in genus Anthemis: chamomile
Genus Chaenactis
- genus of flowering herbs of western United States
Genus Chrysanthemum
- in some classifications many plants usually assigned to the genus Chrysanthemum have been divided among other genera: e.g. Argyranthemum; Dendranthema; Leucanthemum; Tanacetum