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The plants commonly referred to as Butterbur are found in the sunflower family in the genus ''Petasites''.〔Miller, Philip. 1754. Gardeners Dictionary...Abridged...fourth edition page 1056.〕〔(Tropicos, ''Petasites'' Mill. )〕 They are perennial plants with thick, creeping underground rhizomes and large Rhubarb-like leaves during the growing season. Another common name for many species of this genus is Sweet Coltsfoot. ==Characteristics== The short spikes of flowers are produced just before the leaves in spring, emerging with only a few elongated basal bracts and are usually green, flesh coloured or dull white depending on the species. Butterbur can be found in parts of Asia such as Korea, China, and Japan, as well as Europe and North America. They prefer moist environments such as riverbanks, marshes and ditches.〔(【引用サイトリンク】title=Petasites in Flora of North America -Vol. 20 Page 635 Petasites Miller, Gard. Dict. Abr. ed. 4. vol. 3. 1754 )〕〔(【引用サイトリンク】title=Petasites in Flora of China - Vol. 20-21 Page 461 蜂斗菜属 feng dou cai shu Petasites Miller, Gard. Dict. Abr., ed. 4. (). 1754 )〕〔(Altervista Flora Italiana genere ''Petasites'' )〕 ''Petasites'' is very closely related to the genus ''Tussilago'' (Coltsfoot), and also related to the genus ''Senecio''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Petasites」の詳細全文を読む スポンサード リンク
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