| Family | Caryophyllaceae |
| Subfamily | Caryophylloideae |
| Tribe | Sileneae |
| Scientific name | Silene keiskei Miquel var. minor (Takeda) Ohwi & H. Ohashi |
| Synonyms | Silene keiskei Miquel var. minor (Takeda) Ohwi & H. Ohashi forma albescens (Takeda) H. Ohashi, Tateishi & H. Nakai; Melandrium keiskei (Miquel) Ohwi var. minus Takeda; Melandrium keiskei (Miquel) Ohwi var. minus Takeda forma albescens (Takeda) Honda |
| Common name | (Japanese common name) biranji (ビランジ [meaning of biranji is unknown]) |
| (English common name) Japanese Campion | |
| Distribution | (Japan) Honshu (Central region) |
| (Other nations) none | |
| Habitat | Alpine or subalpine rocks |
| Chromosomal number | unknown |
| Description | Plants creeping 50-60cm tall, hairy. Flowers pink or white (forma albescens) ca. 2cm across, flowering in July to August. Perennial plants. |
| Note | Rare species. Endemic to Japan. |
| June 2008 at Koishikawa Botanical Garden |
June 2008 at Koishikawa Botanical Garden |