Viola odorata

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sweet violet

A perennial herb that contains flavonoids, methyl salicylate, odoratine (an alkaloid), saponins and volatile oil; it is diuretic, expectorant and mildly sedative.

Chinese medicine
In traditional Chinese medicine, sweet violet has been used for inflammation and mumps. 

Herbal medicine
In Western herbal medicine, sweet violet is used internally for anxiety, hangovers, headaches, insomnia, sore throat and respiratory infections, and topically for cracked nipples; it was once believed to be effective for skin cancer.
Nausea and vomiting.