| Family | Caryophyllaceae |
| Subfamily | Caryophylloideae |
| Tribe | Sileneae |
| Scientific name | Silene gracillima Rohrbach |
| Synonyms | Lychnis gracillima (Rohrbach) Makino; Lychnis stellarioides Maximovicz |
| Common name | (Japanese common name) senjyu-ganpi (センジュガンピ, 千手岩菲 [meaning: Thousand Armed Avalokiteshwara ganpi (ganpi=Silene coronata Thunbenrg)]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu (north of Central region) |
| (Other nations) none | |
| Habitat | Alpine or subalpine forest |
| Chromosomal number | 2n=24 (2x) |
| Description | Plants 40-100cm tall. Leaves 5-14cm long, 1-3.5cm wide. Flowers white ca. 2cm across, flowering in July to August. Fruits ca. 1cm long. Perennnial plants. |
| Reference | Lychnis gracillima Makino |
| Note | Endemic to Japan. |
| June 2010 at a wild plants nursery |
June 2010 at a wild plants nursery |