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Jacobaea vulgaris Gaertn. - syn.Senecio jacobea L. - Asteraceae
(common) ragwort, St.James-wort, Jacobs-Greiskraut, Jacobskreuzkraut
Erect biennial or perennial herb, 0.30-1(-1.50)m high, native to Europe, West Asia, naturalized in America, Australia; leaves parted, lower ones petioled; flowers golden-yellow, 15-20mm across.
The dried aboveground parts were formerly used in traditional medicine to treat pain and inflammation (externally as poultice). As the plant contain liver-toxic pyrrolizidine alkaloids it is no longer considered safe.
[Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004, 297]
Fuchs, L., New Kreüterbuch, t.425 (1543)
http://plantgenera.org/species.php?id_species=935765