Hall's Aster
Symphyotrichum hallii
Synonyms: Aster chilensis, Aster chilensis ssp. hallii, Aster hallii
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Close-ups of the flower heads and inflorescence of Hall's aster, Multnomah County, Oregon............September 8, 2015.
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Close-ups of the flower heads and stem leaves of Hall's aster, Multnomah County, Oregon............August 6, 2012.
Paul Slichter