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The some of the important invasive alien plants which one would notice in the state of Punjab are viz. Lantana camara, Parthenium hystero-phorus, Ageratum conyzoides, Ricines communis, Eupatorium odoratum, Artemisia scoparia, Datura stramonium, Chenopodium ambrosioides, Cassia occidentalis and Bidens pilosa. These are highly established invasive plant species in the shivalik hills of Punjab and Himachal Pradesh (Dogra et al, 2009).

All Ramsar sites in the state are infested with the invasive weed Eichhornia crassipes. However, in Punjab alien plant like Lantana camara, Parthenium hysterophorus, Ageratum conyzoides and Eichhornia crassipes are the most problematic . They have established themselves not only in the plains but also in hilly areas, particularly in the Himalayan ecosystems (Kohli et al. 2004). Vast areas in Shivalik are infested with these plants. Water hyacinth (Eichhornia crassipes) infestation in the wetlands and marshes of Punjab is threatening to such eco-system. Details of some major invasive alien plants is given below: