n any of several trees having leaves or bark used to allay fever or thought to indicate regions free of fever
n ornamental shrub or small tree of swampy areas in southwestern United States having large pink or white sepals and yielding Georgia bark for treating fever
n tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish
n bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum