| Family | Fumariaceae (alt. Papaveraceae) |
| Scientific name | Corydalis decumbens (Thunberg) Persoon |
| Synonyms | Corydalis amabilis Migo; Corydalis edulioides Fedde var. haimensis Fedde; Corydalis gracilipes S. Moore; Corydalis kelungensis Hayata; Fumaria decumbens Thunberg; Pistolochia decumbens (Thunberg) Holub |
| Common name | (Japanese common name) jirobo-engosaku [second son's Engosaku (Engosaku = a kind of traditional Chinese medicine)] |
| (English common name) none | |
| Distribution | (Japan) Honshu (west of Kanto region), Shikoku, Kyushu |
| (Other nations) China, Taiwan | |
| Chromosomal number | unknown |
| Description | Scapes 5-15cm. Flowers pale purple or purple 15-22mm, flowering in April to May. Perennial plants. |
| Reference | Corydalis decumbens (Thunb.) Pers. |
| Oily composition and process for producing the same (US Patent 6190680/2001) |
| April 2007 at Institute for Nature Study |
April 2007 at Institute for Nature Study |
April 2007 at Institute for Nature Study |
| April 2007 at Institute for Nature Study |
April 2007 at Institute for Nature Study |
April 2007 at Institute for Nature Study |
| April 2007 at Institute for Nature Study |