Rhamnus Purshiana

from The Collaborative International Dictionary of English v.0.48

Cascara buckthorn \Cas"ca*ra buck"thorn`\ (Bot.)
   The buckthorn ({Rhamnus Purshiana}) of the Pacific coast of
   the United States, which yields {cascara sagrada}.
   [Webster 1913 Suppl.]

from The Collaborative International Dictionary of English v.0.48

chittamwood \chittamwood\ n.
   1. a shrubby tree of the U. S. Pacific coast ({Rhamnus
      purshianus} or {Rhamnus purshiana}), whose bark is the
      {cascara sagrada}, used as a mild cathartic or laxative.

   Syn: cascara, cascara buckthorn, bearberry, bearwood,
        chittimwood, {Rhamnus purshianus}.
        [WordNet 1.5]

   2. a deciduous tree of SE U.S. and Mexico.

   Syn: false buckthorn, chittimwood, shittimwood, black haw,
        Bumelia lanuginosa.
        [WordNet 1.5]

   3. a shrubby tree of southern U.S. ({Cotinus obovatus})
      having large plumes of feathery flowers resembling puffs
      of smoke; -- called also {American smoke tree}.

   Syn: American smokewood, {Cotinus americanus}, {Cotinus
        obovatus}.
        [WordNet 1.5]