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Asters
Every rated Symphyotrichum record is fire-resistant — 3 of 5 records, including the genus rated as a group; none is condemned. These counts describe the cited records — 5 records carrying 6 evidence rows from 6 cited sources; they do not make one verdict for the genus.
Fire-resistant
2 species
-
Purple-stemmed Aster Fire-resistant Symphyotrichum puniceum -
Smooth aster Fire-resistant Symphyotrichum (f. Aster) laeve
Awaiting evidence
2 species
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Aster ericoides Awaiting evidence Symphyotrichum ericoides - Fall Aster Awaiting evidence Symphyotrichum oblongifolium
About asters
Corpus context. Symphyotrichum is the directory's #172 largest of 550 genus groups: 5 records carrying 6 evidence rows from 6 cited sources, recorded as perennial , hardy across USDA zones 2–9. Those are corpus facts, not a whole-genus flammability claim.
More about Symphyotrichum: Wikipedia — external references; not evidence sources.