| Name | Petasites japonicus (Siebold & Zuccarini) Maximowicz |
| Authorship | (Siebold & Zuccarini) Maximowicz |
| Rank | Species |
| Placed in | Petasites Miller |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Petasites japonicus (Siebold & Zuccarini) Maximowicz |
| Identification made in | [no date] (2) |