| Family | Ericaceae |
| Scientific name | Vaccinium hirtum Thunberg var. pubescens (Koidzumi) Yamazaki |
| Synonyms | Vaccinium usunoki Nakai |
| Common name | (Japanese common name) usu-no-ki [mortar flower tree] |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) none | |
| Chromosomal number | unknown |
| Description | Plants 1m. Leaves 2-4cm length. Flowers white corollas ca. 6mm, flowering in April to May. Deciduous. Shrub. |
| May 2006 at mountane roadside in Niigata Prefecture |
May 2006 at mountane roadside in Niigata Prefecture |
May 2006 at mountane roadside in Niigata Prefecture |