| Family | Fabaceae (alt. Leguminosae) |
| Subfamily | Faboideae |
| Tribe | Galegeae |
| Subtribe | Astragalinae |
| Scientific name | Oxytropis megalantha H. Boissieu |
| Synonyms | Oxytropis austrosachalinensis auct., non Vassilczenko ex N. S. Pavlova; Oxytropis megalantha H. Boissieu forma albiflora Ohba |
| Common name | (Japanese common name) rebun-sou (レブンソウ, 礼文草 [meaning: Rebun Island weed]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido (Rebun Island) |
| (Other nations) none | |
| Habitat | Alpine rocks |
| Chromosomal number | unknown |
| Description | Plants creeping 5-15cm long. Leaves ca. 10 pairs leaflets. Flowers purple or merely white (forma albiflora) ca. 2cm, flowering in June to July. Perennial plants. |
| Reference | Oxytropis megalantha H. Boissieu |
| Note | Endemic to Japan. |
| July 2008 at Hokkaido University Botanical Garden |
July 2008 at Rokko Alpine Botanical Garden |
July 2008 at Rokko Alpine Botanical Garden |