| Family | Parnassiaceae (also placed in Saxifragaceae) |
| Scientific name | Parnassia palustris L. var. yakusimensis (Masamune) H. Ohba |
| Synonyms | Parnassia palustris L. var. multiseta Ledebour forma minima Masamune; Parnassia yakusimensis Masamune |
| Common name | (Japanese common name) yakushima ume-bachi-sou (ヤクシマウメバチソウ, 屋久島梅鉢草 [meaning: Yakushima Island apricot cups weed]) |
| (English common name) California grass of Parnassus | |
| Distribution | (Japan) Kyushu (Yakushima Island) |
| (Other nations) none | |
| Habitat | Mountane wet rocks. |
| Chromosomal number | unknown |
| Description | Plants electing 5-10cm tall. Leaves ca. 5-10mm wide. Flowers white 1cm across, flowering in September to October. Perennial plants. |
| Reference | Parnassia palustris L. |
| Parnassia palustris var. multiseta Ledebour | |
| Taxonomic Review of Vascular Plants Endemic to Yakushima Island, Japan | |
| Preventions or remedies for arthritis (European Patent Application EP1407777/2005) | |
| Note | Endemic to Japan. |
| October 2009 at my home |
October 2009 at my home |
October 2009 at my home |