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Could anyone please identify this flower/plant found on the semi-shaded banks of a river in East Ireland? It was located near Japanese Knotweed and looks quite similar to this.

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That is Himalayan balsam (Impatiens glandulifera).

Tall, stems often reddish. Lvs opposite or in threes, with small red teeth. Fls large, pale to dark pink-purple, with short bent spur; July-Oct. Bare places, especially by streams.

The Wild Flowers of Britain and Northern Europe. Fitter, Fitter, Blamey. 1974. Collins, London.

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  • $\begingroup$ We have a species of impatiens in the US called Jewelweed. Those seedpods when ripe are fun for kids: they pop suddenly on handling, scattering their seeds. :) The sap is a nice topical anti-itch field remedy for mosquito bites, poison ivy, etc. $\endgroup$ – anongoodnurse Jul 24 '17 at 16:46
  • $\begingroup$ Yes, jewelweed is mentioned as an alternative name on the WP page. It is considered to be an invasive weed in the U.K. because it can take over riverside land. $\endgroup$ – Alan Boyd Jul 24 '17 at 16:49
  • $\begingroup$ Yes, definitely invasive on this certain riverside. $\endgroup$ – Meteodeep Jul 24 '17 at 16:51

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