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- W2299683680 abstract "The genus Senecio includes 1,000 to 3,000 species distributed throughout the world. Senecio and other species that contain pyrrolizidine alkaloids (PA) [i.e., hounds tongue (Cynoglossum officinale), fiddleneck (Amsinckia intermedia), and species of Crotalaria, Borago, Heliotropium and Echium] are perhaps the most important group of poisonous plants worldwide. They are toxic to livestock when grazed or ingested in hay or contaminated grains. They are also toxic to humans when ingested as contaminants in cereals, from PA contaminated milk products (PA's ingested by lactating animals are excreted in the milk), and when made into herbal teas. Tansy ragwort (Senecio jacobaea) is often confused with tansy (Tanacetum vulgare), which has been used in herbal medicines (Cheeke and Shull 1985). Comfrey (Symphytum officinale), which has been reputed as having medicinal properties, also contains PA. In the western US, only 7 Senecio species are reported to be toxic (Kingsbury 1964), but many other species probably contain PA. The greatest economic loss is from cattle poisoning. Horses are also highly susceptible to PA, but sheep and goats are more resistant and may be an effective biological control for some Senecio species. Three Senecio species cause the majority of cattle losses in the western US. Tansy ragwort was introduced from Europe and occurs in the coastal Pacific Northwest and in the Northeast. The plant is a weedy winter annual or biennial that germinates in the fall, over-winters as a rosette, and forms a tall flowering stalk in the spring and summer. It grows on moist well-drained soils in pastures, forests, and wastelands. Thread leaf or woolly grou ndsel (S. douglasii var. Iongilobus) grows principally in the Southwest. It is a lowgrowing, perennial, evergreen shrub and is most abundant on loamy to clay soils. Its leaves and stems are covered with a white woolly pubescence. It is an increaser species that becomes abundant on abused and degraded rangeland." @default.
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- W2299683680 date "1989-12-01" @default.
- W2299683680 modified "2023-09-29" @default.
- W2299683680 title "Senecio: a dangerous plant for man and beast." @default.
- W2299683680 hasPublicationYear "1989" @default.
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