Source : Webster's Revised Unabridged Dictionary (1913)

Cassidony \Cas"si*do*ny\, n. [Cf. LL. cassidonium, F.
   Cassidoine. See {Chalcedony}.] (Bot.)
   (a) The French lavender ({Lavandula St[oe]chas}).
   (b) The goldilocks {(Chrysocoma Linosyris)} and perhaps other
       plants related to the genus {Gnaphalium} or cudweed.

Source : WordNet®

Lavandula stoechas
     n : shrubby grayish lavender of southwestern Europe having
         usually reddish-purple flowers [syn: {French lavender}]