]> NEBC barcode-00700208 United States of America Massachusetts Concord, s.e. Walden Pond, in the same drainage system as Thoreau's Well Meadow where he collected this species on 19 June 1859! Sphenopholis pensylvanica (Linnaeus) Hitchcock (Linnaeus) Hitchcock 2020-05-01 16:45:03 R. J. Eaton