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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 has been introduced into the United States, where it is often regarded as a noxious weed. Its common names are longstamen rice [3] and red rice. [4] The host resistance gene, Xa21, from O. longistaminata, has been integrated into the genome of O. sativa as it confers broad resistance to rice blight disease caused by Xanthomonas oryzae pv ...
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 ...
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.
Alhagi maurorum is a noxious weed outside its native range. [4] 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.
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]
It is classed as an invasive species in places around the Great Lakes, such as the Sleeping Bear Dunes National Lakeshore [10] and the Chicago region, [11] in the Pacific Northwest, [12] and California where it is a declared noxious weed.
Sometimes becoming a noxious weed outside its native range. It is an invasive species in California, where it is an invasive weed of chaparral and coastal sage scrub habitat along the southern and central coastal regions. [4] It was first introduced to Davis in the Sacramento Valley as a drought-tolerant range grass for grazing. [5] [6]