Kerstin Hinze / Honeybee (Apis melifera) flying around and nectaring from Butterbur (Petasites hybridus) flowers, Bavarian Forest National Park, Germany, April.

Wild Wonders of Europe / D'Amicis / Old Norway spruce (Picea abies) tree with Butterbur (Petasites albus) growing beneath it, Western Tatras, Carpathian Mountains, Slovakia, June 2009

Geoff Simpson / Buttebur flower {Petasites hybridus} Cheshire, UK.

Geoff Simpson / Butterbur flower emerging {Petasites hybridus} Derbyshire Peak District NP, UK

Nigel Cattlin / Butterbur (Petasites hybridus) flowering on bank of Kennet and Avon Canal, near Hungerford, Berkshire, England, UK. April.

Nigel Cattlin / Butterbur (Petasites hybridus), on bank of Kennet and Avon Canal, Hungerford, Berkshire, England, UK. March.

Nigel Cattlin / Butterbur (Petasites hybridus), on bank of Kennet and Avon Canal, Hungerford, Berkshire, England, UK. March.

Kerstin Hinze / Greater bee fly (Bombylius) nectaring from Butterbur (Petasites hybridus) flowers, Bavarian Forest National Park, Germany, April.

Kerstin Hinze / Greater bee fly (Bombylius) nectaring from Butterbur (Petasites hybridus) flowers, Bavarian Forest National Park, Germany, April.

Kerstin Hinze / Greater bee fly (Bombylius) nectaring from Butterbur (Petasites hybridus) flowers, Bavarian Forest National Park, Germany, April.

Nature Production / Giant butterbur (Petasites japonicus) flower, Shirakami Sanchi UNESCO World Heritage Site, Yamamoto County, Akita Prefecture, Japan.

Paul Hobson / Butterbur (Petasites albus) purple flower morph, Lathkill Dale, Peak District, Derbyshire, England, UK, March.