Source : WordNet®

purple avens
     n 1: North American perennial with hairy basal pinnate leaves and
          purple flowers and plume-tipped fruits [syn: {prairie
          smoke}, {Geum triflorum}]
     2: erect perennial of north temperate zone having pinnate
        leaves and few nodding flowers with brown-purple calyx and
        orange-pink petals [syn: {water avens}, {Indian chocolate},
         {chocolate root}, {Geum rivale}]