| Family | Ranunculaceae |
| Subfamily | Ranunculoideae |
| Tribe | Ranunculeae |
| Scientific name | Ranunculus extorris Hance var. lutchuensis (Nakai) Tamura |
| Synonyms | Ranunculus extorris Hance var. lutchuensis (Nakai) Tamura ex Shimabuku forma izumikawae Ta.Takara |
| Common name | (Japanese common name) ryukyu-hiki-no-kasa (リュウキュウヒキノカサ, 琉球蛙傘 [meaning: Okinawa frog umbrella]) |
| (English common name) none | |
| Distribution | (Japan) Kyushu (Kagoshima), Okinawa |
| (Other nations) none | |
| Habitat | Wet field |
| Chromosomal number | unknown |
| Description | Plants 15-30cm tall. Flowers 12-17mm accross, 5 yellow petals each 6-7mm long, flowering in February to March. Fruits 4-7mm long. Perennial plants. |
| Note | Rare species. |
| December 2011 at my home |
December 2011 at my home |
December 2011 at my home |