1. knotweed (Polygonaceae); jointweed; smartweedUsually written using kana alone
2. water pepper (Persicaria hydropiper)Usually written using kana alone, See also 柳蓼
Wikipedia definition
3. Persicaria hydropiperWater-pepper or Water pepper (Persicaria hydropiper, syn. Polygonum hydropiper) is a plant of the family Polygonaceae. It grows in damp places and shallow water. It is a cosmopolitan plant, found in Australia, New Zealand, temperate Asia, Europe, and North America. It has some use as a spice because of its pungent flavour.
Read “Persicaria hydropiper” on English Wikipedia
Read “タデ” on Japanese Wikipedia
Read “Persicaria hydropiper” on DBpedia
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