Publication: Mem. Torrey Bot. Club. 5: 328. 1894.
selected vouchers: WTU
Notes: FNA20: "Erigeron subtrinervis is variable in vestiture, perhaps reflecting gene exchange with E. speciosus. Erigeron speciosus var. mollis (A. Gray) S. L. Welsh may be a recurrent hybrid; it is identified here within E. subtrinervis."