| Family | Caryophyllaceae |
| Subfamily | Alsinoideae |
| Tribe | Alsineae |
| Scientific name | Stellaria radians L. |
| Synonyms | Cerastium fimbriatum sensu Ledebour, non E. Pritzel; Fimbripetalum radians (L.) Ikonnikov; Stellaria radians L. forma fimbriata (Ledebour) Kitagawa; Stellaria radians L. var. ovato-oblonga Koidzumi |
| Common name | (Japanese common name) ezo-oh-yama-hakobe (エゾオオヤマハコベ, 蝦夷大山繁縷 [meaning: Ezo large mountain hakobe (Ezo = an old name of Hokkaido, hakobe = Stellaria media)]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu (north of Central region) |
| (Other nations) Russia, Korea, China, Mongolia | |
| Habitat | Mountane forest or forest edge |
| Chromosomal number | unknown |
| Description | Plants ca. 60cm tall. Leaves 6-11cm long, 2cm wide. Flowers pedicels 1.5-3.5cm long, calyx lobes 7-9mm long, white petals 8-11mm long, 10 stamens, 3 styles, flowering in July to August. Fruits ca. 9mm long, seeds 2mm long. Perennial plants. |
| Reference | Stellaria radians Linnaeus |
| July 2008 at Karuizawa Botanical Garden |
July 2008 at Karuizawa Botanical Garden |
July 2008 at Karuizawa Botanical Garden |
| July 2008 at Karuizawa Botanical Garden |
July 2008 at Karuizawa Botanical Garden |