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Common names: Whitetop, Whitehead, Barley flower, Congress Grass, Amargosa, Escoba Amarga

An erect annual herb with alternate, deeply-dissected leaves, growing up to 2 m tall with much branched inflorescences bearing white flower heads and numerous obovoid, smooth and black achenes.

Parthenium is a native of tropical America and was introduced into Africa, Asia and Oceania in cereal and grass seed shipments from U.S.A. during the 1950s.

Parthenium is wide-spread in grassland, fruit tree orchards and arable land in neutral and acid soils.