| parthenium | (n) small genus of North American herbs and shrubs with terminal panicles of small ray flowers, Syn. genus Parthenium |
| american feverfew | (n) stout perennial herb of the eastern United States with whitish flowers; leaves traditionally used by Catawba Indians to treat burns, Syn. Parthenium integrifolium, wild quinine, prairie dock |
| bastard feverfew | (n) tropical American annual weed with small radiate heads of white flowers; adventive in southern United States, Syn. Parthenium hysterophorus |
| feverfew | (n) bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum, Syn. Tanacetum parthenium, Chrysanthemum parthenium |
| guayule | (n) much-branched subshrub with silvery leaves and small white flowers of Texas and northern Mexico; cultivated as a source of rubber, Syn. Parthenium argentatum |