| Family | Saxifragaceae |
| Scientific name | Peltoboykinia watanabei (Yatabe) H. Hara |
| Synonyms | Boykinia watanabei (Yatabe) Makino; Peltoboykinia tellimoides (Maximovicz) H. Hara var. watanabei (Yatabe) H. Hara; Saxifraga watanabei Yatabe |
| Common name | (Japanese common name) watanabe-sou (ワタナベソウ, 渡辺草 [meaning: Mr. Watanabe's weed]) |
| (English common name) none | |
| Distribution | (Japan) Shikoku (Ehime Prefecture, Tokushima Prefecture), Kyushu |
| (Other nations) none | |
| Habitat | Mountane forest |
| Chromosomal number | unknown |
| Description | Leaves 15-35cm long. Scapes electig 40-60cm tall.Flowers pale yellow petals each ca. 8-13mm long, in June to July. Perennial plants. |
| Reference | A monograph of Boykinia, Peltoboykinia, Bolandra and Suksdorfia (Saxifragaceae) |
| Note | Rare species. |
| July 2008 at my home |
July 2008 at my home |
July 2008 at my home |
| July 2008 at my home |
| April 2009 at my home |