horse nettle

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A prickly-stemmed plant (Solanum carolinense) of eastern and central North America, having purplish or white star-shaped flowers and yellowish berries.

GNU Webster's 1913

1. n. a coarse, prickly, American herb, the Solanum Carolinense.

WordNet 3.0

1. n. coarse prickly weed having pale yellow flowers and yellow berrylike fruit; common throughout southern and eastern United States