Source : Webster's Revised Unabridged Dictionary (1913)

Sauce-alone \Sauce"-a*lone`\, n. [Etymol. uncertain.] (Bot.)
   Jack-by-the-hedge. See under {Jack}.

Source : WordNet®

sauce-alone
     n : European herb that smells like garlic [syn: {garlic mustard},
          {hedge garlic}, {jack-by-the-hedge}, {Alliaria
         officinalis}]