WordNet sense 1 (perennial herb of North America):

bee balm, Monarda fistulosa

WordNet sense 2 (perennial aromatic herb of eastern North America having variously colored tubular flowers in dense showy heads):

bergamot mint, Monarda didyma, oswego tea

WordNet sense 3 (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):

lemon balm, garden balm, Melissa officinalis, sweet balm