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native species, such that no individuals contain the entire genotype of the native species, thus effectively driving the native species to extinction. The accepted scientific name is now Delairea odorata. Camelthorn is considered to be a weed in its much of its native range. Five western states have declared it a noxious weed. Related web links: Distribution map: Spread Rate graph: Glaucium corniculatum Red horn poppy is a recognized weed in Europe, Australia, South America, and throughout North America. Invasion Meltdown, often invading species interact with one another to generate a problem where either species alone would be harmless, a concept known as invasion meltdown. (1998) ranked it as invasive for the Pacific Northwest. Many wetland ecologists consider this to be a problem species, but it has been declared noxious only in New Hampshire. The Nile perch, a voracious predator, was introduced to Lake Victoria in Africa as a food fish. Related web links: Distribution map: Spread Rate graph: Centaurea dealbata. It is a recognized weed in Australia, South America, South Africa, Japan, and Europe.
Related web links: Distribution map: Spread Rate graph: Gypsophila acutifolia Little is known about sharpleaf babys breath. Although invasive of some regions oregano is not regulated. Previously ranked as invasive by Toney. It is well known in the Pacific Northwest because it was placed on the Federal Noxious Weed List in the 1980s. It has no documented history of invasive behavior except in California and Japan. This thorny leguminous shrub reproduces mostly from its vigorous rhizomes. Biological control, biological control involves introducing an enemy of an invasive plant (i.e., a disease, parasite, predator, or competitor) in an attempt to lower the population size of the invader. Known to be a weed in Europe and Japan. This species has not been studied in any detail. It is considered to be a weed throughout much of its European native range. For example, ten moth species that could live only on chestnut trees became extinct. The iucn Invasive Species Group has included Myriophyllum spicatum in its list of the world's 300 worst invasive species.
Related web links: Distribution map: Spread Rate graph: Linaria bipartita Clovenlip toadflax has only one record from Latah County (Moscow) ID, in 2000, otherwise it has only been documented as established in California. (1991) in the Geographic Atlas of World Weeds was one of the first to note this species as a problem plant. Hybridization, hybridization occurs when members of two different species mate with one another and produce viable offspring that carry genes from both parents.