Valerian n. : Any plant of the genus Valeriana. The root of the officinal valerian (V. officinalis) has a strong smell, and is much used in medicine as an antispasmodic.

Example:
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Taxonomy
Valerian, Valeriana officinalis, herb, Valerian root, Inhibitors, plant, Flora, medicinal herb, unranked, Allosteric Modulators, Valerian tea, free encyclopedia, garden valerian, Dosage, insomnia, anxiety, receptors, sleep.

Defination from the web:
Valerian (Valeriana officinalis, Valerianaceae) is a hardy perennial flowering plant, with heads of sweetly scented pink or white flowers. ... Valerian, in pharmacology and phytotherapic medicine, is the name of a herb or dietary supplement prepared from roots of the plant, which, after ...