,

"[Plin. Nat. 26.52.] - CEPÆA: ONE REMEDY.
The plant known as “cepæa” is even more efficacious. It resembles purslain in appearance, but has a darker root, that is never used: it grows upon the sands of the sea-shore, and has a bitter taste. Taken in wine with root of asparagus, it is remarkably useful for diseases of the bladder.”
(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.)