Petasites japonicus, also known as butterbur, giant butterbur, great butterbur and sweet-coltsfoot, is an herbaceousperennial plant in the family Asteraceae.[3] It is native to China, Japan, Korea and Sakhalin and introduced in Europe and North America. It was introduced to southern British Columbia in Canada by Japanese migrants.[4][5]
It is dioecious, with male and female flowers produced on separate individuals. Occasionally, morphologically hermaphroditic (but functionally sterile) flowers exist.[6]
^National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review the Dietary Reference Intakes for Sodium and Potassium (2019). Oria, Maria; Harrison, Meghan; Stallings, Virginia A. (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). ISBN978-0-309-48834-1. PMID30844154. Archived from the original on 2024-05-09. Retrieved 2024-06-21.
^Sakai, Satoki; Suzuki, Yuka; Itagaki, Tomoyuki; Tsujisawa, Hisashi; Makino, Takashi T. (2008). "On the function of hermaphrodite florets in female inflorescences of Petasites japonicus (Asteraceae)". Botany. 86 (2): 179–184. doi:10.1139/B07-121.