White flowers with pink buds in clusters.
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Many thanks synangium. Looks spot on. I did check all the Pink family pics on the best Slovenian plant site I could find http://www.zaplana.net/flowers/asp/flower_family_en.asp but it wasn't there. It's obviously not as comprehensive as I hoped..
Nick Upton, naturalist and photographer.
Lat/Lng: 46.2737, 13.9338
Margin of a hay meadow near riverbank, 500m altitude