Petasites Versipilus
''Petasites'' is a genus of flowering plants in the sunflower family, Asteraceae, that are commonly referred to as butterburs and coltsfoots.''Petasites''.
Flora of North America. Volume 20, Page 635. efloras.org. They are perennial plants with thick, creeping underground rhizomes and large rhubarb-like leaves during the growing season. Most species are native to Asia or southern Europe.

Characteristics

The short spikes of flowers are produced just before the leaves in late winter (e.g. ''Petasites fragrans'') or spring, emerging with only a few elongated basal bracts and are usually green, flesh coloured or dull white depending on the species. It is dioecious, with male and female flowers borne on separate plants. Butterbur can be found in parts of Asia such as Korea, China, a ...
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Petasites Hybridus
''Petasites hybridus'', the butterbur, is a herbaceous perennial flowering plant in the family Asteraceae, native to Europe and northern Asia. Although used over centuries in traditional medicine to treat various disorders, there are no approved medical uses, but it is sold as a dietary supplement. Concerns about the potential toxic effects of pyrrolizidine alkaloids in butterbur limit its use in human and animal studies. Etymology and common names The botanical name ''Petasites'' derived from the Greek word, ''petasos'', from the plant's broad leaves resembling a wide-brimmed hat. ''Butterbur'' may have derived from the use of leaves to wrap butter centuries ago. It is also called ''bog rhubarb'', ''Devil's hat'', and ''pestilence wort''. Synonym (taxonomy), Synonyms include ''P. officinalis'', ''P. ovatus'', ''P. vulgaris'', and ''Tussilago petasites'' L. Description The species is Dioecy, dioecious, the male and female flowers being borne on separate plants. In Britain, the ...
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