WordNet (r) 3.0 (2006):

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