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Petasites hybridus

Authority (L.) G.M. & Sch. Family Magnoliopsida:Asteridae:Asterales:Compositae Synonyms Petasites officinalis Moench., Petasites vulgaris Desf. Common names butter bur, echte Pestwurz, Etelänruttojuuri (Finish), Hjartablaðka (Iceland?), Lækjepestro (Norwegian), pestilensrot, pestrot, pestskrå, Petasiditisradix, Petasitidis folium, Rød Hestehov (Danish), Rote Pestwurz, skrå, Tordenskræppe (Danish) Editor Ecocrop code 15851

Notes
DESCRIPTION: It has large rounded leaves reaching over 1 m in diameter forming patches that cover big areas of ground. The leaf base is cordate, over side green and underside greyish pubescent. Inflorescences are pale red reaching up to 1.5 m in height. USE: Leaves and roots have medicinal applications. Roots are used against digestion and muscular problems. GROWING PERIOD: Perennial. COMMON NAMES: Butter bur, Eechte pestwurz, Petasitidis folium, Rød Hestehov, Tordenskræppe, Rote Pestwurz. FURTHER INF: It thrives on moist ground in regions with relatively long, warm summers, and mild winters. Found along the river and stream sides and in the wet ditches along roads. With its large leaves it often monopolises stretches of river banks. Found in areas covered by snow usually 120 to 180 days where average temperature falls down to -15°C or less.
Sources
http://www.natur.cuni.cz/~pop2002/exc.pdf, http://www.fns.uniba.sk/zp/iucn/eng/projekty/dec/all.txt