You may wonder how we select species to appear on our web site. The species on our web site satisfy two criteria:
1)They have been observed spreading into natural areas, as non-native invaders;
2)They are species for which we have documents or original photographs.
Therefore, be advised that the species on our web site in the http://invasivepests.org domain should not, together, be construed as any kind of comprehensive "list" of invasive plants, animals, or pathogens. Conversely, the absence of a plant from our web site should not be interpreted as significant in any way--even the most dreadful invasive species would not be noted on our site if we do not have useful information about it.
"Lists" of non-native, invasive species are necessarily framed in the context of a specific area. A plant that is a native species in one area may be a non-native invader in another area. (For example, Andropogon virginicus is a valuable native plant in the eastern USA, but is a non-native invader in Hawai'i.) Our web site provides information on many (but not all) of the species invading natural areas within the area that The Nature Conservancy works, including North America (Canada, Mexico, USA), Latin America, and parts of Asia/Pacific.