| Family | Hamamelidaceae |
| Scientific name | Corylopsis pauciflora Siebold & Zuccarini |
| Synonyms | Corylopsis matsudae Kanehira & Sasaki |
| Common name | (Japanese common name) hyuga mizuki [Hyuga water tree (Hyuga is an old name of Miyazaki Prefecture). However, history of the plants name is unkonwn.] |
| (English common name) buttercup winter hazel | |
| Distribution | (Japan) Honshu (Japan Sea side of Kinki region) |
| (Other nations) Taiwan | |
| Chromosomal number | 2n=24 |
| Description | Plants 2-3m. Leaves 2-5cm. Flowers 5 yellow petals each 8-9mm, flowering in March to April. Deciduous. Sub. |
| Reference | Corylopsis pauciflora Siebold & Zucc. |
| Corylopsis pauciflora Siebold & Zuccarini |
| March 2007 at Tsukuba Botanical Garden |
March 2007 at Tsukuba Botanical Garden |
March 2007 at Tsukuba Botanical Garden |
| March 2007 at Tsukuba Botanical Garden |
| December 2007 at Tsukuba Botanical Garden |
December 2007 at Tsukuba Botanical Garden |