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Hoy you have brought back memories. It is many years since we travelled by Norwegian Railways on the Flam railroad. The only train I know that stops en route for everyone to get off and take a picture of the waterfall. (I'm talking of the days before digital cameras and phones).
At Finse railway station you can find all the colours from pure white to dark pink, almost red. I have never been there when the seeds are ripe though!
I have never seen pleno forms in the wild but I know they can be found. I have seen excellent forms pictured. The montane forms I have seen usually have less divided leaves.
Thanks, Hoy, really interesting.Received wisdom here is that the lighter colours are crosses between Silene dioica and Silene latifolia. In this thread some knowledgeable people explained to me how to tell the two species apart http://www.srgc.net/forum/index.php?topic=15493.0 . Does Silene latifolia grow wild in Norway? Me neither, but a few months ago I read a note from someone who found a flore pleno form of Ranunculus acris with the finely-divided leaves I might expect. Interesting to see the leaves of that montane form in your picture. Perhaps the widely-cultivated form of flore pleno originally came from up a mountain somewhere?
Very nice landscapes and flowers carpets, as Maggie pointed out it looks cold.
Alan,I can't say whether the plants at Finse are hybrids or not - but I assume they are not. S. latifolia alba is naturalized in Norway but rarer than S dioica. As Finse is a much visited railway station you never know what somebody might have brought with them.
There are 35 silene dioica cultivars listed in the RHS plant finder, including a pleno form called 'Firefly' with a PBR designation (see e.g. here https://www.bluebellcottage.co.uk/plants/SIL120-Silene-dioica-Firefly-PBR-Campion-Firefly ). But all the obtainable ones are the normal red or possibly pink. I grow a few of these and my favourite is a cultivar called 'Inane' which had reddish leaves, the normal 'red' flowers and which goes on flowering throughout the summer on long sprawling flower stems.