| Family | Myrsinaceae (also placed in Primulaceae) |
| Scientific name | Lysimachia clethroides Duby |
| Synonyms | Lysimachia sororia Miquel; Lysimachia clethroides Duby var. sororia (Miquel) Kunth |
| Common name | (Japanese common name) oka-tora-no-o (オカトラノオ, 岡虎尾 [meaning: hillock tiger tail]) |
| (English common name) gooseneck loosestrife, gooseneck yellow loosestrife | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia, Korea, China, Taiwan | |
| Habitat | Wet field, forest edge |
| Chromosomal number | 2n=24 |
| Description | Plants 70-100cm tall. Leaves 6-13cm long, 2-5cm wide. Flowers inflorescences 10-30cm long, white corollas 8-12mm across, flowering in June to July. Perennial plants. |
| Reference | Lysimachia clethroides Duby |
| Lysimachia clethroides Duby |
| June 2007 at Ushiku Forest Park |
June 2007 at Ushiku Forest Park |
June 2007 at Ushiku Forest Park |
| June 2007 at Ushiku Forest Park |
June 2007 at Ushiku Forest Park |
June 2007 at Ushiku Forest Park |