| Family | Papaveraceae |
| Subfamily | Chelidonioideae |
| Scientific name | Hylomecon japonica (Thunberg) Prantl & Kündig forma dissecta (Franchet & Savatier) Okuyama |
| Synonyms | Chelidonium japonicum Thunberg forma dissectum (Franchet & Savatier) Ohwi; Hylomecon japonica (Thunberg) Prantl & Kündig var. dissecta (Franchet & Savatier) Franchet & Savatier ex Matsumune; Stylophorum japonicum (Thunberg) Miquel var. dissectum Franchet & Savatier |
| Common name | (Japanese common name) yamabuki-sou (セリバヤマブキソウ, 芹葉山吹草 [meaning: seri lieved yamabuki like weed (seri = Oenanthe javanica; yamabuki = Kerria japonica)]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) unknown | |
| Habitat | Mountane forest |
| Chromosomal number | inknown |
| Description | Scapes 25-40cm tall. Flowers yellow 3-4cm across, flowering in April to May. Perennial plants. |
| Reference | Hylomecon japonica (Thunb.) Prantl |
| Plant germination inhibitor and method of use thereof (US Patent 20070274956) | |
| Note | Relatively rare. |
| May 2009 at Karuizawa Botanical Garden |
May 2009 at Karuizawa Botanical Garden |
May 2009 at Karuizawa Botanical Garden |
| May 2009 at Karuizawa Botanical Garden |