Group: Spermatophytina (Spermatophytes)
Family: Polygonaceae (Knotgrass family)
Genus: Reynoutria ()
Reynoutria japonica Houtt. - Japanese Knotweed
Reynoutria sachalinensis (F. Schmidt) Nakai - Giant Knotweed
<ba>Up to 5 m tall</ba>, <b>perennial</b>, erect, <i>not</i> twining. <span class="v1">flowers:</span> <ba>greenish to whitish</ba>. <span class="v1">perianth:</span> 5‑leaved. <span class="v1">outer tepals:</span> <b>keeled to winged</b>. <span class="v1...
The colours represent the floristic status of the species in the respective region. Green indicates native occurrences, light green naturalized occurrences. Adventive occurrences are represented by light yellow shades and plants that are cultivated (but rarely occur in the wild) are dark yellow. Grey colours are used, if the floristic status of species is unknown or uncertain.
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Natural, established occurences |  |
Artificial occurences |
The color intensity reflects the species' abundance
Data: Floristische Kartierung Deutschlands (Stand 2013), Bundesamt für Naturschutz (www.floraweb.de)
riparian vegetation, mudflat vegetation, reedbeds, perennial herbaceous vegetation, ruderal vegetation, parks, gardens
in nutritious, moist to wet, periodically flooded habitats