• WordNet 3.6
    • n Parthenium small genus of North American herbs and shrubs with terminal panicles of small ray flowers
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Century Dictionary and Cyclopedia
    • n parthenium A genus of composite plants, of the tribe Helianthoideæ and subtribe Melampodieæ, known by the small broad rays, and the thickish compressed or triangular achenes, often firmly united to the enveloping bract, and with narrow margins separating half-way at maturity. There are about 6 species, natives of North America and the West Indies. They are usually rough hairy herbs, with alternate leaves, undivided, toothed, or pinnately dissected, and small heads of whitish or yellowish flowers in a terminal panicle. P. Hysterophorus, a weed throughout warmer America, and used medicinally, is known in Jamaica as wild wormwood, whitehead, brown-bush, bastard feverfew, and West Indian mugwort. P. integrifolium, of the southern United States, is used as a febrifuge.
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In literature:

Professor Asa Gray described it and named it Parthenium argentatum, or the silver Pallas.
"Creative Chemistry" by Edwin E. Slosson
We of course went to see the ruins of the Parthenium, built by Pericles and ornamented with the marbles of Phidias.
"Around the World with Josiah Allen's Wife" by Marietta Holley
Parthenium Hysterophorus L. Composite family.
"Texas Honey Plants" by C. E. Sanborn