black nightshade

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

• noun Any of several annual plants of the genus Solanum, especially the Eurasian species S. nigrum, widespread as a weed, which has clusters of white, star-shaped flowers and blackish berries that are poisonous when unripe.

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

• noun Eurasian herb naturalized in America having white flowers and poisonous hairy foliage and bearing black berries that are sometimes poisonous but sometimes edible