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Petasites hybridus (L.) G.Gaertn. - syn.Petasites officinalis Moench; Tussilago hybrida L. - Asteraceae
butterbur, (Gewöhnliche) Pestwurz

Dioecious perennial herb, native to Europe and Western Asia; flowers white to pink-purple, all without rays, produced in the early spring before the leaves; basal leaves huge, long-petioled, tomentose beneath, up to 60cm in diameter, nearly orbicular.
„The plants are functionally dioecious, the staminate flowers without rays but marginal pistillate ones often with conspicuous though relatively short rays. Pistillate heads may have numerous rays.“
http://michiganflora.net/genus.aspx?id=Petasites

„Three spasmolytically active substances which contain no nitrogen, namely petasin and the petasolesters B and C, were isolated from Petasites officinalis Moench. They are all esters of the same C15-alcohol. Petasin is an ester of angelic acid, whereas the petasolesters B and C are derivates of a new acid containing sulphur, the β-methylmercapto-acrylic acid.“
[Über Inhaltsstoffe ausPetasites officinalis Moench I. Petasin und die Petasolester B und C., Stoll, A., Morf, R., Rheiner, A., Renz, J., Experientia, Vol.12(9), 1956, 360-362]

By HPLC, 14 genuine sesquiterpenes of P.hybridus were seperated from different plant parts (rhizome, roots, runners, buds, leaves and stalks). „The six main compounds (isopetasin 1b, neopetasin 2b, petasin 3b, iso-S-petasin 1f, neo-S-petasin 2f and S-petasin 3f) have been quantitatively determined. These compounds are abundant in a subterranean parts, with the exception of isopetasin 1b, which is found in somewhat higher concentrations in leaves than in roots. In all the subterranean parts petasin 3b, which is known to have the highest spasmolytic activity, is by far the most important sesquiterpene ester. In a typical specimen, highest contents of petasin have been found in the rhizomes (9376 μg/g dried material), followed by the runners and the roots with 7018 and 7002 μg/g, respectively.“
[Sesquiterpenes of Petasites hybridus (L.) GM et Sch.: distribution of sesquiterpenes over plant organs., Debrunner, B., Neuenschwander, M., Brenneisen, R., Pharmaceutica Acta Helvetiae, Vol.70(2), 1995, 167-173]

„Allergic rhinitis symptoms of itching, sneezing, rhinorrhea, and nasal obstruction significantly decrease patients’ quality of life. Compared with histamine and leukotriene receptor antagonists, the petasol butenoate complex Ze 339 displays pharmacologically distinct properties. In vitro it inhibits the biosynthesis of leukotrienes and mediator release from activated eosinophils.“
[Petasol butenoate complex (Ze 339) relieves allergic rhinitis–induced nasal obstruction more effectively than desloratadine., Dumitru, A.F., Shamji, M., Wagenmann, M., Hindersin, S., Scheckenbach, K., Greve, J., Chaker, A.M., Journal of Allergy and Clinical Immunology, Vol.127(6), 2011,1515-1521]