| Family | Orchidaceae | 
| Subfamily | Orchidoideae | 
| Tribe | Orchideae | 
| Subtribe | Orchidinae | 
| Scientific name | Platanthera sachalinensis F. Schmidt | 
| Synonyms | Habenaria transnokoensis (Ohwi & Fukuyama) S. S. Ying; Platanthera longibracteata Hayata; Platanthera transnokoensis Ohwi & Fukuyama; Tulotis transnokoensis (Ohwi & Fukuyama) S. S. Ying; Tulotis ussuriensis (Regel) H. Hara var. transnokoensis (Ohwi & Fukuyama) T. S. Liu & H. J. Su | 
| Common name | (Japanese common name) oh-yama-sagi-sou (オオヤマサギソウ, 大山鷺草 [meaning: large mountain herron grass]) | 
| (Chinese common name) gao shan she chun lan (高山舌唇蘭) | |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu | 
| (Other nations) Russia (eastern Siberia, Sakhalin), Korea, Taiwan | |
| Habitat | Alpine forest | 
| Chromosomal number | 2n=42 | 
| Description | Plants electing 40-60cm tall. Leaves 2 (or merely 1 or 3), each 9-23cm long, 2-8cm wide. Flowers inflorescences 8-20cm long, pale yellow side sepals 4-5mm long, mid sepals 3-3.5mm long, lip petals 5-7mm long, flowering in July to August. Terrestrial. Perennial plants. | 
| Reference | Platanthera sachalinensis Fr. Schmidt | 
| Platanthera sachalinensis F. Schmidt | |
| Platanthera sachalinensis F. Schmidt | |
| Platanthera sachalinensis F.Schmidt 1868 | 
| July 2008 at Tsukuba Botanical Garden  | 
      July 2008 at Tsukuba Botanical Garden  |