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"[Plin. Nat. 27.68.] - HYPECOÖN.
Hypecoön is a plant found growing in corn-fields, with leaves like those of rue. Its properties are similar to those of juice of poppies."
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)