Petasites albus, the white butterbur, is a flowering plant species in the daisy family "Asteraceae". Native butterbur contains some carcinogenic compounds, but a purified version, Petadolex, does not. Among alternative medicines, butterbur has the best evidence for its use. Rawan butterbur is nationally renowned and has been designated as a Hokkaido Heritage. They lived in pits with roofs made from butterbur leaves. The stories follow three friends&colon; Berry, Butterbur, and Rosebay. Long-term health effects and interaction of butterbur with other drugs have not been well documented. Along riversides, there occurs white butterbur. Butterbur delivered a letter from Gandalf which he had forgotten to deliver months earlier. Butterbur was a fat, bald Man with a bad memory. Butterbur is the common name of several plants in the genus "Petasites". James Grout played Butterbur in BBC Radio's 1981 serialization of "The Lord of the Rings".