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This is a parasitic noxious weed, Striga gesnerioides, commonly called Witchweed. This is a terrestrial noxious weed, Drymaria arenarioides commonly called Lightning weed. It is sometimes confused with daisies. Some noxious weeds are harmful or poisonous to humans, domesticated grazing animals, and wildlife. Open fields and grazing pastures ...
Oryza rufipogon is an invasive species and listed as a 'noxious weed' by the United States, [19] and listed as a noxious weed in Alabama, California, Florida, Massachusetts, Minnesota, North Carolina, Oregon, South Carolina, and Vermont.
Kickxia spuria is a species of flowering plant in the family Plantaginaceae known by several common names, including roundleaf cancerwort [1] and round-leaved fluellen. [2] It is native to Europe and Asia, but it is present on other continents as an introduced species, and sometimes a noxious weed.
This species is well known as a noxious weed, both in its native range and in areas where it is an introduced and often invasive species. [7] [8] [9] It is naturalized in some areas, and it is recorded as an adventive species in others. [3] It grows in many types of disturbed habitat, such as roadsides, and in cultivated fields.
It is native to Europe, but it is known on most continents as an introduced species and often a noxious weed. It is a hardy bunchgrass which grows in many types of urban, cultivated, and disturbed habitat. It is a weed of many types of agricultural crops, growing in vineyards and fields. Herbicide-resistant strains have been noted. [4]
This species can also be called a noxious weed in North America, and can be found in areas such as pastures and along the sides of the road. [16] The species and genus is a favorite food plant of caterpillars of the painted lady butterfly (Vanessa cardui), which derives its specific epithet, cardui, from their preference for Carduus thistles ...
Some weed species have been classified as noxious weeds by government authorities because, if left unchecked, they often compete with native or crop plants or cause harm to livestock. [41] They are often foreign species accidentally or imprudently imported into a region where there are few natural controls to limit their population and spread. [42]
It is an invasive exotic weed in the United States, with significant infestations in California, Arizona, New Mexico, and Texas. It is listed as a Federal Noxious Weed by the United States Department of Agriculture. It is also a common weed in parts of Australia, New Zealand, and Mexico, and it thrives in any area with a Mediterranean climate.