Summary description from Wikipedia:

Symphyotrichum firmum in languages:

English

glossy-leaved aster

English

smooth swamp aster

English

shining aster

Images from inaturalist.org observations:

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Parent Taxon

• Symphyotrichum

Sibling Taxa

• Symphyotrichum anticostense
• Symphyotrichum elliottii
• Symphyotrichum firmum
• Symphyotrichum novi-belgii
• Symphyotrichum prenanthoides
• Symphyotrichum puniceum
• Symphyotrichum retroflexum
• Symphyotrichum rhiannon
• Symphyotrichum robynsianum

Top Observation Places

• Wheaton
• Ann Arbor
• Oshawa
• Peterborough
• Vaughan
• Richmond Hill
• London
• Madison
• Cambridge
• Guelph