Source : Webster's Revised Unabridged Dictionary (1913)

Bedstraw \Bed"straw`\, n.
   1. Straw put into a bed. --Bacon.

   2. (Bot.) A genus of slender herbs, usually with square
      stems, whorled leaves, and small white flowers.

   {Our Lady's bedstraw}, which has yellow flowers, is {Galium
      verum}.

   {White bedstraw} is {G. mollugo}.

Source : WordNet®

bedstraw
     n : any of several plants of the genus Galium