| Family | Caprifoliaceae |
| Scientific name | Triosteum sinuatum Maximovicz |
| Synonyms | none |
| Common name | (Japanese common name) tsukinuki-sou (ツキヌキソウ, 突抜草 [meaning: penetrating stems weed]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (Nagano Prefecture) |
| (Other nations) China | |
| Habit | Mountane forest. |
| Chromosomal number | 2n=18 |
| Description | Plants electing ca. 1m tall, hairy. Leaves 10-15cm long. Flowers pale yellow corollas ca. 1cm long, flowering in April to May to June. Perennial plants. |
| Reference | Triosteum sinuatum Maxim. |
| Note | Rare species. |
| June 2009 at Karuizawa Botanical Garden |
June 2009 at Karuizawa Botanical Garden |
June 2009 at Karuizawa Botanical Garden |
| June 2009 at Karuizawa Botanical Garden |
| June 2009 at Karuizawa Botanical Garden |
June 2009 at Karuizawa Botanical Garden |