valerian
    n 1: a plant of the genus Valeriana having lobed or dissected
         leaves and cymose white or pink flowers

Valerian \Va*le"ri*an\, n. [LL. valeriana, perhaps from some
   person named Valerius, or fr. L. valere to be strong.
   powerful, on account of its medicinal virtues: cf. F.
   val['e]riane.] (Bot.)
   Any plant of the genus Valeriana. The root of the officinal
   valerian (Valeriana officinalis) has a strong smell, and is
   much used in medicine as an antispasmodic.
   [1913 Webster]

   Greek valerian (Bot.), a plant (Polemonium caeruleum)
      with blue or white flowers, and leaves resembling those of
      the officinal valerian.
      [1913 Webster]