| Family | Apiaceae (alt. Umbelliferae) |
| Scientific name | Pternopetalum tanakae (Franchet & Savatier) Handel-Mazzetti |
| Synonyms | Carum tanakae Franchet & Savatier; Cryptotaeniopsis tanakae (Franchet & Savatier) H. de Boissieu; Pimpinella tanakae (Franchet & Savatier) Diels; Pternopetalum tanakae (Franchet & Savatier) Handel-Mazzetti var. tanakae (C. B. Clarke) Ridley |
| Common name | (Japanese common name) iwa-sen-tou-sou (イワセントウソウ, 岩仙洞草 [meaning rocks sen-tou-sou (sen-tou-sou = Chamaele decumbens)]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China | |
| Habitat | Mountane or subalpine forest edge |
| Chromosomal number | unknown |
| Description | Plants 10-25cm tall. Flowers white, flowering in March to July. Fruits 2-2.5mm long. Perennial plants. |
| Reference | Pternopetalum tanakae (Franchet & Savatier) Handel-Mazzetti |
| Pternopetalum tanakae (Franch. & Sav.) Hand.-Mazz. |
| July 2009 at Mt. Fuji |
July 2009 at Mt. Fuji |
July 2009 at Mt. Fuji |
| July 2009 at Mt. Fuji |