| Family | Orchidaceae |
| Subamily | Epidendroideae |
| Tribe | Gastrodieae |
| Subtribe | Gastrodiinae |
| Scientific name | Gastrodia gracilis Blume |
| Synonyms | Gastrodia dioscoreirrhiza Hayata; Gastrodia taiwaniana Fukuyama |
| Common name | (Japanese common name) nayo-tenma (ナヨテンマ, 弱天麻 [meaning: weak tenma (tenma = Japanese pronunciation of a traditional Chinese medicine)]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu (Chiba Prefecture, Shizuoka Prefecture, Aichi Prefecture, Hiroshima Prefecture), Shikoku, Kyushu |
| (Other nations) Taiwan | |
| Habitat | Mountane wet evergreen bloadleaf tree forest. |
| Chromosomal number | unknown |
| Description | Plants electing 10-60cm tall. Leaves none. flowers 5-15, pale yellow 6-7mm long, flowering in June to July. Terrestrial. Saprophytes. |
| Reference | Gastrodia gracilis Blume |
| Gastrodia gracilis Blume | |
| Gastrodia gracilis Blume | |
| Note | Rare species |
| Photo by Mr. Yoshiaki Kitada | Photo by Mr. Yoshiaki Kitada |
| June 2008 at Chiba Prefecture |
June 2008 at Chiba Prefecture |