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Symphyotrichum hesperium (A. Gray) Á. Löve & D. Löve. Siskiyou Aster. Phen: Aug-Oct. Hab: Stream banks, ditches. Dist: ON and NT south to MI, IA, KS, CO, w. TX, NM, AZ, CA, and Mexico. Reported for ne. OK and nc. and se. TX by Kartesz (2021).

Origin/Endemic status: Native

Synonymy: = Aster hesperius A.Gray – GrPl, Tx; = Aster lanceolatus Willd. ssp. hesperius (A.Gray) Semple & Chmiel. – NcTx, Semple & Chmielewski (1987); = Symphyotrichum lanceolatum (Willd.) G.L.Nesom ssp. hesperium (A.Gray) G.L.Nesom – K3, K4; = Symphyotrichum lanceolatum (Willd.) G.L.Nesom var. hesperium (A.Gray) G.L.Nesom – FNA20, Mi

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Heliophily ?: 9

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