vaccinium vacillans

from The Collaborative International Dictionary of English v.0.48

Blueberry \Blue"berry\, n. [Cf. {Blaeberry}.] (Bot.)
   The berry of several species of {Vaccinium}, an ericaceous
   genus, differing from the American huckleberries in
   containing numerous minute seeds instead of ten nutlets. The
   commonest species are {Vaccinium Pennsylvanicum} and
   {Vaccinium vacillans}. {Vaccinium corymbosum} is the tall
   blueberry.
   [1913 Webster]