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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 ...
It is native to southwestern Europe, but has been introduced into Australia and California, where it has become a noxious weed. The plant is a biennial herb producing an erect, branching, winged, spiny stem known to exceed two meters in maximum height. The spiny leaves may be up to 50 centimetres (20 in) long and are divided into deep toothed ...
Alhagi maurorum is a noxious weed outside its native range. [3] It is a contaminant of alfalfa seed, and grows readily when accidentally introduced to a cultivated field. It has a wide soil tolerance, thriving on saline, sandy, rocky, and dry soils. It does best when growing next to a source of water, such as an irrigation ditch.
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.
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.
Centaurea calcitrapa is a species of flowering plant known by several common names, including common star thistle, red star-thistle [2] and purple star thistle.It is native to Europe but is known across the globe as an introduced species and often a noxious weed.
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 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.