| Alyssum alyssoides | 
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| Scientific classification | 
| Kingdom: | Plantae | 
 
| Clade: | Tracheophytes | 
 
| Clade: | Angiosperms | 
 
| Clade: | Eudicots | 
 
| Clade: | Rosids | 
 
| Order: | Brassicales | 
 
| Family: | Brassicaceae | 
 
| Genus: | Alyssum | 
| Species: | A. alyssoides | 
| Binomial name | 
| Alyssum alyssoides 
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| Synonyms | 
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Adyseton alyssoides (L.) Nieuwl.Adyseton calycinum Scop.Adyseton campestre MoenchAdyseton mutabile MoenchAlyssum alsinifolium HostAlyssum arvaticum Jord.Alyssum calicinum Neck.Alyssum calycinum Haens. ex NymanAlyssum calycinum L. nom. illeg.Alyssum campestre (L.) L.Alyssum campestre Hoffm.Alyssum conglobatum Fil. & Jáv.Alyssum erraticum Jord.Alyssum lusitanicum Brot. ex NymanAlyssum montanum Brot.Alyssum parviflorum Schloss. ex NymanAlyssum phymatocarpum Schloss. & Vuk.Alyssum polyodon Boiss. & BusheAlyssum ruderale Jord.Alyssum sabulosum Jord.Alyssum schlosseri Heuff. ex Schloss. & Vuk.Alyssum sublineare Jord.Alyssum vagum Jord.Clypeola alyssoides L.Clypeola calycina All. ex Steud.Clypeola campestris L.Clypeola minor L. nom. inval.Crucifera alyssoides E.H.L.KrauseCrucifera calycina E.H.L.KrausePsilonema alyssoides (L.) HeidemannPsilonema calycinum (L.) C.A. Mey.Psilonema campestre (L.) Schur
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Alyssum alyssoides is a species of flowering plant in the mustard family known by several common names, including pale madwort and yellow alyssum. It is native to Eurasia, but it can be found throughout much of the temperate world as an introduced species and sometimes a common weed. For example, it has been noted as a weed in the western United States. It often appears in arable fields, sandy tracks, pits, and docks.