| Family | Clethraceae |
| Scientific name | Clethra barbinervis Siebold & Zuccarini |
| Synonyms | Clethra barbinervis var. kawadana (Yanagita) H. Hara; Clethra kawadana Yanagita; Clethra stolonifera Nakai; Clethra wuyishanica Ching ex L. C. Hu; Clethra wuyishanica var. erosa L. C. Hu. |
| Common name | (Japanese common name) ryobu [Japanese pronunciation of Chinese common name] |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China | |
| Chromosomal number | 2n=32 |
| Description | Plants 8-10m. Leaves 8-13cm. Flowers white corollas each 5-6mm, flowering in June to September. Deciduous. Arbor trees. |
| Reference | Clethra barbinervis Siebold & Zuccarini |
| Clethra barbinervis Siebold & Zucc. | |
| Herbicidal compositions (US Patent 4552583/1985) | |
| Recovering metals from soil (US Patent 7268273/2007) |
| June 2007 at lowland forest edge |
June 2007 at lowland forest edge |
June 2007 at lowland forest edge |
| June 2007 at lowland forest edge |
| December 2007 at Tsukuba Botanical Garden |
December 2007 at Tsukuba Botanical Garden |
December 2007 at Tsukuba Botanical Garden |