Monarda (bee balm, horsemint, oswego tea, or bergamot) is a genus consisting of roughly 16 species of erect, herbaceous annual or perennial plants in the Lamiaceae, indigenous to North America. Ranging in height from 1 to 3 feet (0.2 to 0.9 m), the plants have an equal spread, with slender and long-tapering (lanceolate) leaves; the leaves are opposite on stem, smooth to nearly hairy, lightly serrated margins, and range from 3 to 6 inches (7 to 14 cm) long. In all species, the leaves, when crushed, exude a spicy, highly fragrant oil. Of the species listed, M. didyma (Oswego Tea) contains the highest concentration of this oil.