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Genus Arctotis
- herbs and subshrubs: African daisy
Genus Argyranthemum
- comprises plants often included in the genus Chrysanthemum
Genus Argyroxiphium
- small genus of Hawaiian spreading and rosette-forming shrubs
Genus Arnica
- large genus of herbs of north temperate and arctic regions
Genus Artemisia
- usually aromatic shrubs or herbs of north temperate regions and South Africa and western South America: wormwood; sagebrush; mugwort; tarragon
Genus Aster
- large genus of herbs widely cultivated for their daisylike flowers
Genus Ayapana
- genus of tropical American herbs sometimes included in genus Eupatorium
Genus Baccharis
- shrubs of western hemisphere often having honey-scented flowers followed by silky thistlelike heads of tiny fruits; often used for erosion control