WordNet sense 1 (shrubby tree of the Pacific coast of the United States; yields cascara sagrada):

bearberry, bearwood, chittimwood, cascara buckthorn, Rhamnus purshianus

WordNet sense 2 (deciduous tree of southeastern United States and Mexico):

shittimwood, false buckthorn, black haw, Bumelia lanuginosa

WordNet sense 3 (shrubby tree of southern United States having large plumes of feathery flowers resembling puffs of smoke):

American smokewood, Cotinus americanus, Cotinus obovatus