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The odour of this plant, the leaves of which are used in medicine, is strongly narcotic, and the taste bitter. They ire narcotic, diuretic, and aperient; and have been used in dropsies. Lactuca elongata, Wild Lettuce of the United States, has been employed for L. virosa.

A species of lettuce which affords lactucarium.

Acrid lettuce; found in Europe, abounding in a bitter, milky, unpleasantly smelling juice which was long reputed to be diuretic and narcotic. It furnishes the lactucarium of the U. S. Ph. [Lat.]