Leaves blade-shaped or slightly ovate, petiole not distinct from the rest of the leaf; leaf margin smooth without teeth

Flat-topped White Aster Doellingeria umbellata	Upland White Aster Oligoneuron album	Rush Aster Symphyotrichum boreale
Perennial Salt-Marsh Aster Symphyotrichum tenuifolium	Narrow-leaved White-topped Aster Seriocarpus linifolius	Tradescant's Aster Symphyotrichum tradescantii
	Heath Aster Symphyotrichum ericoides