| Family | Plantaginaceae (also placed in Scrophulariaceae; Veronicaceae) |
| Tribe | Gratioleae |
| Scientific name | Deinostema adenocaulum (Maximovicz) T. Yamazaki |
| Synonyms | Gratiola adenocaula Maximovicz; Gratiola violacea Maximovicz var. adenocaule (Maximovicz) Makino |
| Common name | (Japanese common name) maru-ba-no-sawa-tougarashi (マルバノサワトウガラシ, 丸葉沢唐辛子 [meaning: round leaved swamp sweet pepper]) |
| (English common name) none | |
| Distribution | (Japan) Honshu, Shikoku, Kyushu |
| (Other nations) Korea, China | |
| Habitat | Swamp |
| Chromosomal number | unknown |
| Description | Plants 5-20cm tall. Leaves 4-10cm long, 3-5mm wide. Flowers pale purple corollas 4mm, flowering in August to October. Annual plants. |
| Reference | Deinostema adenocaula (Maximowicz) T. Yamazaki |
| September 2006 at rice paddy |
September 2006 at rice paddy |
September 2006 at rice paddy |
| September 2006 at rice paddy |
September 2006 at rice paddy |
September 2006 at rice paddy |