Petasites japonicus (Siebold & Zucc.) Maxim.
Asteraceae
| Collection Number | Not collected |
| Collectors | (D. Boufford, C. Davidson, S. R. Christoph) |
| Identified By | D. Boufford (GH) |
| Source | C. Davidson |
| Date | 26 May 2016 |
| Country | Japan |
| region | Honshu |
| prefecture | Niigata |
| Location | Myoko Togakushi Renzan National Park. Sasagamine area. Trail east of Suginosawa Lodge through moist woods and some boggy areas; toward a small pond. 1254 m elev. |
| Lat/Long | N 36 51 21.6 E 138 05 25.3 |