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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
Genus Anaphalis
- genus of herbs of north temperate regions having hoary leaves: pearly everlasting
Genus Andryala
- genus of hardy hairy latex-producing perennials of Mediterranean area
Genus Antennaria
- small woolly perennial herbs having small whitish discoid flowers surrounded by a ring of club-shaped bristles
Genus Antheropeas
- small genus of North American herbs often included in genus Eriophyllum