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Ragwort was formerly much employed medicinally for various purposes. The leaves are used in the country for emollient poultices and yield a good green dye, not, however, permanent. The flowers boiled in water give a fair yellow dye to wool previously impregnated with alum.
It is used with success in relieving rheumatism, sciatica and gout, a poultice of the green leaves being applied to painful joints and reducing the inflammation and swelling. It makes a good gargle for ulcerated throat and mouth, and is said to take away the pain caused by the sting of bees.
Yes this is very likely to be this plant.More facts if youre interested; Its called jacobaea because there is a moth called Tryia Jacobaeae(cinabar moth)maybe???the orang/black caterpillars love to eat the foliage,its reputed to be their favorite-Found in grassy places near road sides, dune slacks,waste ground and found in rural and urban areas.very common as its name implies.
Lat/Lng: 50.3053, -5.2311
OS grid ref: SW700500