Marsh Gentian - Gentiana pneumonanthe
Seen in St Pietersberg, Maastricht, Holland. Aug 2014.
https://waarneming.nl/species/2538/photos/?

''Gentiana pneumonanthe'' is a species of the genus ''Gentiana''. It was the first wildflower announced as flower of the year in Germany in 1980. The species can be found in marshes and moorlands. It is the host-plant of the Alcon Blue.
Similar species: Gentianales
By Patomarazul
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Uploaded Jan 10, 2022. Captured Aug 24, 2014 12:53 in RMCP+C8 Maastricht, Netherlands.