Source : Webster's Revised Unabridged Dictionary (1913)

Gladen \Gla"den\, n. [AS. gl[ae]dene, cf. L. gladius a sword.
   Cf. {Gladiole}.] (Bot.)
   Sword grass; any plant with sword-shaped leaves, esp. the
   European {Iris f[oe]tidissima}. [Written also {gladwyn},
   {gladdon}, and {glader}.]

Source : WordNet®

Iris foetidissima
     n : iris with purple flowers and evil-smelling leaves; southern
         and western Europe and North Africa [syn: {stinking iris},
          {gladdon}, {gladdon iris}, {stinking gladwyn}, {roast
         beef plant}]