Parthenium hysterophorus (Family: Asteraceae), locally called gajar ghas or Congress grass, is an alien weed which entered into India along with wheat imported from USA in the early 1950s. This datasheet on Parthenium hysterophorus covers Identity, Overview, Distribution, Dispersal, Hosts/Species Affected, Diagnosis, Biology & Ecology, Environmental ... ABSTRACT Parthenium hysterophorus L., commonly known as carrot weed or congress grass in India has been considered as one of the worst weeds responsible for causing health problems in men and animals besides loss to crop productivity and plant biodiversity. The weed has infested about 35 million hectares of land in India since its first notice in 1955. Now it has become one of the main weeds in almost all types of agricultural lands besides infesting wasteland, community land, road and ... Parthenium ( Partheniumhysterophorus L.) also known as star weed, carrot weed, white cap, white top, etc. has been found growing naturally since centuries in Mexico, North and South America, Australia, China, Pacific islands, East and South Africa and Canada.
