| Family | Polygonaceae |
| Subfamily | Polygonoideae |
| Scientific name | Persicaria posumbu (Buchanan-Hamilton ex D. Don) H. Gross |
| Synonyms | Polygonum posumbu Buchanan-Hamilton ex D. Don; Polygonum caespitosum Blume var. laxiflorum; Polygonum caespitosum Blume subsp. yokusaianum (Makino) Danser; Polygonum yokusaianum Makino; Persicaria cespitosum (Blume) Nakai; Persicaria yokusaiana (Makino) Nakai |
| Common name | (Japanese common name) hana tade (ハナタデ, 花蓼 [meaning: flowering tade (tade = Polygonaceae plants)]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu, Okinawa |
| (Other nations) Korea, China, Taiwan, Philippines, Thailand, Indonesia, Myanmar, Nepal, India | |
| Habitat | Forest, forest edge |
| Chromosomal number | unknown |
| Description | Plants 30-60cm tall. Leaves 3-9cm long. Flowers pink perianths ca. 2mm long, flowering in August to October. Fruits ca. 2mm long. Annual plants. |
| Reference | Persicaria posumbu (Buch.-Ham. ex D. Don) H. Gross |
| Polygonum posumbu Buchanan-Hamilton ex D. Don |
| October 2007 at edge of forest |
September 2006 at edge of forest |
September 2006 at edge of forest |
| October 2007 at edge of forest |
| September 2006 at edge of forest |
September 2006 at edge of forest |
September 2006 at edge of forest |