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but the stalk seems much more substantial, ie thicker/chunkier than any other examples of Dame's-Violet I have seen.
Sadly this observation was made some distance away so I am unlikely to have an early opportunity to check whether or not it is flowering or has flowered. That said, the observation was made over a month ago and the flowers in this example look fairly imminent.
I had hoped that the very interesting edges of the leaves would help someone more expert than me to identify it.
Thanks for thinking about it.
It isn't this particular variety but could the similarity of the leaf, and in particular its edge, shown here indicate some kind of Impatiens? http://www.missouriplants.com/Whitealt/Impatiens_balsamina_page.html
The observation was in a semi sandy spot very close to a river which has seen a lot of flooding this year. Perhaps its a garden escapee.
I've just had a close look at a Hesperis leaf. There are pale hydathodes along the edge, just like your plant, but yours seems to have a higher density. There are also some forked hairs, I can't quite make out whether there are any of these on your photos. I'll post some pics in a minute.
OK, it's at http://www.ispot.org.uk/node/345221. Have a look and see what you think.
Lat/Lng: 54.7272345, -1.8894296
OS grid ref: NZ072369
On a river bank.