The Collaborative International Dictionary of English v.0.48:

Sanguinaria \San`gui*na"ri*a\, n. [NL. See Sanguinary, a. &
   n.]
   1. (Bot.) A genus of plants of the Poppy family.
      [1913 Webster]

   Note: Sanguinaria Canadensis, or bloodroot, is the only
         species. It has a perennial rootstock, which sends up a
         few roundish lobed leaves and solitary white blossoms
         in early spring. See Bloodroot.
         [1913 Webster]

   2. The rootstock of the bloodroot, used in medicine as an
      emetic, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Sanguinaria
    n 1: one species: bloodroot [syn: Sanguinaria, genus
         Sanguinaria]