This chapter aims to place giant hogweed, Heracleum mantegazzianum, into a wider generic context in terms of taxonomy, genetic relationships with related taxa and distribution in both its native and invaded ranges. A brief excursion into past botanical investigations which were carried out in the...

Perennial pepperweed (PPW), Lepidium latifolium L., is a mustard of central Asian origin that is invading natural and cultivated habitats in North America and is difficult to control with conventional means. Biological control of PPW is hampered by the fact that it is relatively uncommon in its...