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"[Plin. Nat. 27.67.] - THE HYPOGLOSSA: ONE REMEDY.
The hypoglossa is a plant with leaves like those of the wild myrtle, of a concave form, prickly, and presenting another small leaf within, resembling a tongue in shape. A wreath made of these leaves, placed upon the head, alleviates headache. "
(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.)