The Butterbur reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Butterbur

Butterburs
Scientific Classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Asterales Family: Asteraceae Tribe: Senecioneae Genus: Petasites
Species
Many

The plants commonly referred to as Butterbur are found in the daisy family Asteraceae in the genus Petasites. They are mostly quite robust plants with thick, creeping underground rhizomes and large Rhubarb-like leaves during the growing season.

The short spikes of flowers are interestingly produced just before these leaves in Spring, emerging with only a few elongated basal bracts and are usually green, flesh coloured or dull white depending on species.

Petasites is very closely related to the huge genus Senecio.

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