| Family | Rosaceae |
| Scientific name | Aruncus dioicus (Walter) Fernald var. insularis H. Hara |
| Synonyms | none |
| Common name | (Japanese common name) shima yamabuki shouma [Izu Ohshima Island yamabuki leaved shouma (yamabuki = Kerria japonica (L.) De Candolle, shouma = a traditional Chinese medicine)] |
| (English common name) none | |
| Distribution | (Japan) Izu Islands |
| (Other nations) none | |
| Chromosomal number | unknown |
| Description | Plants electing 30-90cm. Leaves leaflets each 3-10cm length. Flowers white, flowering in June to August. Perennial plants. |
| Note | Endemic to Japan |
| June 2007 at Tsukuba Botanical Garden |
June 2007 at Tsukuba Botanical Garden |
June 2007 at Tsukuba Botanical Garden |