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| September 2008 at Mt. Tsukuba |
September 2008 at Mt. Tsukuba |
September 2008 at Mt. Tsukuba |
| Family | Polygonaceae |
| Subfamily | Polygonoideae |
| Scientific name | Persicaria nepalensis (Meisner) H. Gross |
| Synonyms | Cephalophilon nepalense (Meisner) Tzvelev; Polygonum alatum Buchanan-Hamilton ex Sprengel; Polygonum alatum Buchanan-Hamilton ex Sprengel var. nepalense (Meisner) Hooker f.; Polygonum nepalense Meisner; Polygonum perforatum Meisner var. laevigatum Meisner; Polygonum punctatum Buchanan-Hamilton ex D. Don |
| Common name | (Japanese common name) tani- soba (タニソバ, 谷蕎麦 [valley soba (soba = buckwheat)]) |
| (English common name) none | |
| Distribution | (Japan) Hokkaido, Honshu, Shikoku, Kyushu |
| (Other nations) Russia, Korea, China, Taiwan, Philippines, Thailand, Malaysia, Indonesia, Papua New Guinea, Nepal, Bhutan, India, Pakistan, Afganistan, Tropical Africa, USA | |
| Habitat | Wet forest edge |
| Chromosomal number | 2n=48 |
| Description | Plants 10-35cm tall, non hair. Leaves 2.5-5cm long. Flowers white or pale purple perianths ca. 2-3mm long, flowering in August to September. Fruits 1.5mm long. Annual plants. |
| Reference | Persicaria nepalensis (Meisn.) H. Gross |
| Persicaria nepalensis (Meisn.) H. Gross | |
| Persicaria nepalensis (Meisner) H. Gross |
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| September 2008 at Mt. Tsukuba |
September 2008 at Mt. Tsukuba |
September 2008 at Mt. Tsukuba |
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| September 2008 at Mt. Tsukuba |
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| September 2008 at Mt. Tsukuba |
September 2008 at Mt. Tsukuba |
