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|Noun||1.||white-topped aster - herb having corymbose white-rayed flowers with scaly bracts and silky indehiscent fruits|
flower - a plant cultivated for its blooms or blossoms
genus Sericocarpus, Sericocarpus - small genus of herbs of the eastern United States: white-topped asters
narrow-leaved white-topped aster - a variety of white-topped aster