| Family | Fabaceae (alt. Leguminosae) |
| Subfamily | Faboideae |
| Tribe | Phaseoleae |
| Subtribe | Phaseolinae |
| Scientific name | Vigna angularis (Willdenow) Ohwi & Ohashi var. nipponensis (Ohwi) Ohwi & Ohashi |
| Synonyms | Azukia angularis (Willdenow) Ohwi var. nipponensis (Ohwi) Ohwi; Phaseolus angularis (Willdenow) W. F. Wight forma nipponensis (Ohwi) Kitamura; Phaseolus angularis (Willdenow) W. F. Wight var. nipponensis (Ohwi) Ohwi; Phaseolus nipponensis Ohwi |
| Common name | (Japanese common name) yabu-turu-azuki (ヤブツルアズキ, 藪蔓小豆 [meaning: bush climing azuki bean]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China, Taiwan, Nepal | |
| Habitat | Mountane forest edge |
| Chromosomal number | 2n=22 |
| Description | Leaves ternate, terminal leaflet 3-7cm long, 2-5cm wide. Flowers yellow, flowering in August to September. Fruits 4-5cm long, ca. 4mm wide. Vine. Annual plants. |
| Reference | Vigna angularis (Willd.) Ohwi & Ohashi var. nipponensis (Ohwi) Ohwi & Ohashi |
| Vigna angularis (Willd.) Ohwi & H. Ohashi var. nipponensis (Ohwi) Ohwi & H. Ohashi | |
| Note | Vigna angularis var. nipponensis is a vine plants. On the other hand, Vigna angularis (Vigna angularis var. angularis) is not vine. |
| September 2006 at edge of forest |
September 2006 at edge of forest |
September 2006 at edge of forest |
| September 2006 at edge of forest |
September 2006 at edge of forest |
September 2006 at edge of forest |