2009.08.27 Austria, Vienna XI. district (170 m AMSL).Flower: this one only just began flowering. F. japonica isn't so much spreading through fruits but rather through rhizomes which are washed away by rivers during floodings.German name: Japan-Flgelknterich (Japan-Staudenknterich)
2009.08.27 Austria, Vienna XI. district (170 m AMSL).Flowering in july/august/september.Not native to Austria, both escaped from culture and was seeded in forests and on rivers (as food for deer and to green embankments after river regulations) before people realised that this species is extremely invasive and aggressively suppresses native plants.Meantime, F. japonica most likely is beyond any chance of wiping it out in natural habitats where it does not belong: in marshlands and on river embankments. It grows also in huge numbers alongside some motorways or railway tracks (the latter is the habitat of this one here).German name: Japan-Flgelknterich (Japan-Staudenknterich)
2009.08.27 Austria, Vienna XI. district (170 m AMSL).Leaves: for this species typical is the basis of the leaf ("flattened", with nerves forming its border near the stem).German name: Japan-Flgelknterich (Japan-Staudenknterich)
2011-10-21 Vienna XI. district, Albern - Cemetary of the Nameless Dead (157 msm Quadrant 7865/1).German name: Japan-Flgelknterich (Japan-Staudenknterich)Introduced species, invasive; this specimen here however is planted as an ornamental plant in the park round the chapel of the cemetary.
Summary[edit] Description: Japanese Knotweed (Reynoutria japonica) in Oslo, Norway. Date: 15 August 2020, 17:41. Source: Own work. Author: Ryan Hodnett.
