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| March 2007 at residential street | March 2007 at residential street | March 2007 at Higashiyama Botanical Garden |
| Family | Polygonaceae |
| Subfamily | Polygonoideae |
| Scientific name | Persicaria capitata (Buchanan-Hamilton ex D. Don) H. Gross |
| Synonyms | Cephalophilon capitatum (Buchanan-Hamilton ex D. Don) Tzvelev; Polygonum capitatum Buchanan-Hamilton ex D. Don |
| Common name | (Japanese common name) hime-turu-soba (ヒメツルソバ, 姫蔓蕎麦 [meaning: dwarf creeping soba (soba = Fagopyrum cymosum)]) |
| (English common name) pink-head knotweed | |
| Distribution | (Japan) Honshu (west of Kanto region), Shikoku, Kyushu, Okinawa |
| (Other nations) [native] China, Taiwan, Vietnam, Thailand, Malaysia, Myanmar, Bhutan, Nepal, India, Sri Lanka, Pakistan | |
| Habitat | Roadside, farm yard, field |
| Chromosomal number | 2n=22 |
| Description | Plants creeping. Leaves 1-1.35cm long, 0.6-2cm wide. Flowers pink or white perianths ca. 2mm long, flowering in all seasons. Fruits ca. 1.5-2mm long. Perennial plants. |
| Reference | Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross |
| Persicaria capitata (Buchanan-Hamilton ex D. Don) H. Gross | |
| Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross | |
| Note | Naturalized plants (introduced in Meiji era, widespread mainly in 1960th). |
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| March 2007 at residential street | March 2007 at residential street | March 2007 at Higashiyama Botanical Garden |
