Assertion: swamp aster | /r/HasProperty | symphyotrichum boreale
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Source sentences:
text: By comparison with other white asters having a generally similar leaf shape, Northern Bog Aster (Symphyotrichum boreale), Panicled Aster (S. lanceolatum), Ontario Aster (S. ontarionis), and Awl Aster (S. pilosum) have flowers with more than 15 rays and brighter yellow disks.