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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
Genus Chrysothamnus
- genus of low branching shrubs of western North America
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