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Genus Adlumia
- one species: climbing fumitory
Genus Dicentra
- North American and Asian herbs with divided leaves and irregular flowers
Genus Achillea
- perennial often aromatic and sometimes mat-forming herbs of north temperate regions: yarrow; milfoil
Genus Acroclinium
- genus of herbs and shrubs of Australia and South Africa: everlasting flower; most species usually placed in genus Helipterum
Genus Ageratina
- annual to perennial herbs or shrubs of eastern United States and Central and South America
Genus Ageratum
- genus of tropical American herbs grown for their flowers
Genus Amberboa
- herbs of Mediterranean to central Asia cultivated for their flowers
Genus Ambrosia
- comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae
Genus Ammobium
- small genus of Australian herbs grown for their flowers