Parthenium is a genus in the family Asteraceae. Notable species in this genus include the Guayule. Native to tropical Americas, Parthenium is an aggressive weed invading all disturbed land, including farms, pastures, and roadsides. Contact with this plant causes dermatitis and respiratory malfunction in humans, dermatitis in cattle and domestic animals, due to the presence of toxin Parthenin.[1][2] This plant has been declared a weed of national significance in Australia and India. [3] The Jicarilla used Parthenium incanum for medicine (Opler 1946: 8). Pictures
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