| Family | Rosaceae |
| Scientific name | Spiraea niopponica Maximovicz |
| Synonyms | Spiraea niopponica Maximovicz forma rotundifolia Makino |
| Common name | (Japanese common name) iwa-shimotsuke [rock shimotsuke (shimotsuke = Spiraea japonica L. f.)] |
| (English common name) none | |
| Distribution | (Japan) Honshu (north of Kinki region) |
| (Other nations) none | |
| Chromosomal number | unknown |
| Description | Plants 1-2m. Leaves 1-2.5cm. Flowers white 7-10mm, flowering in May to June. Deciduous. Shrub. |
| Note | Endemic to Japan |
| May 2007 at Tsukuba Botanical Garden |
May 2007 at Tsukuba Botanical Garden |
May 2007 at Tsukuba Botanical Garden |