The Collaborative International Dictionary of English v.0.48:

crackerberry \crackerberry\ n.
   a creeping red-berried perenial herb (Cornus canadensis)
   distinguished by clustered leaf whorls at tips of shoots;
   Greenland to Alaska.

   Syn: bunchberry, dwarf cornel, pudding berry, Cornus
        canadensis.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

crackerberry
    n 1: creeping perennial herb distinguished by red berries and
         clustered leaf whorls at the tips of shoots; Greenland to
         Alaska [syn: bunchberry, dwarf cornel, crackerberry,
         pudding berry, Cornus canadensis]