Alien Vascular Plants of Europe

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Economics of invasive species policy and management (2017, background): “2 Invasive plants have most often arrived as intentional horticultural or ornamental introductions, but also as crop seed contaminants (Reichard and White 2001; Pyšek et al. 2009).”
Invasive species in Europe: ecology, status, and policy (2011, background): “The remaining species were introduced unintentionally, mostly associated with transport vectors, or as contaminants of seeds and other commodities [34].”
Prospects for biological control of Ambrosia artemisiifolia in Europe: learning from the past (2011, background): “In Europe, as in most other regions of the world, the number of alien plant species has increased considerably in the past 200 years as a result of increasing trade, tourism and disturbance (Pyšek et al., 2009).”
An updated checklist of the vascular flora alien to Italy (2018, background): “Considering the 791 naturalized and invasive neophytes occurring in Italy, only the United Kingdom (857 taxa; Pyšek et al. 2009) shows higher numbers.”