Photo: Polygonum capitatum.

Flowering plant. Nagai bot.g., Osaka, Japan. Planted. 2001-05-09.
Polygonum capitatum Buch.-Ham. ex D. Don Engl.: pinkhead smartweed. Suom.: nuppitatar. Bot. syn.: Persicaria capitata (Buch.-Ham. ex D. Don) Gross.
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Photo: Polygonum capitatum.