bee balm

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An aromatic eastern North American herb (Monarda didyma) in the mint family, having variously colored, tubular bilabiate flowers grouped in dense showy heads. Also called bergamot.

Wiktionary

1. n. The aromatic plant Monarda punctata or bergamot, native to North America.

WordNet 3.0

1. n. perennial herb of North America
2. n. perennial aromatic herb of eastern North America having variously colored tubular flowers in dense showy heads
3. n. bushy perennial Old World mint having small white or yellowish flowers and fragrant lemon-flavored leaves; a garden escapee in northern Europe and North America