tree tobacco

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A poisonous South American shrub or small tree (Nicotiana glauca) naturalized in the United States, having yellow flowers and thick blue-green oval leaves.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock