vervain(redirected from v. simplex)
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A perennial herb that contains alkaloids, bitter principles, glycosides (verbenin), tannins and volatile oil. Vervain is antipyretic, antispasmodic, contraceptive and diuretic; it has been used for headaches, skin infections, dysentery, suppressing appetite, increasing breast milk and as a liver and nerve tonic.
any member of the family Verbenaceae, e.g. verbenaofficinalis.