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Genus Cnicus
- 1 species: blessed thistle
Genus Conyza
- common American weed or wildflower
Genus Coreopsis
- genus of American plants widely cultivated for their flowers
Genus Cosmos
- genus of tropical American plants cultivated for their colorful flowers
Genus Cotula
- cosmopolitan herbs especially southern hemisphere; many used as ground covers
Genus Craspedia
- herbs of Australia and New Zealand
Genus Crepis
- hawk''s beard; cosmopolitan in northern hemisphere