Marsh Gentian - Gentiana pneumonanthe
These were the darkest blue flowers.
This (above) is the more common colour.
Many were much paler and often had a marbled appearance, which can be seen better in photos taken from above, looking down into the trumpet. It's very difficult to get a shot with the whole flower in focus but here are a couple of my better efforts which show the variation between individuals well.
They never fail to amaze me. It's like they're painted!
On our first visit this was the only (almost) white flower, tantalizingly close to being open!
A couple of weeks later several were open.
Although not as showy as the 'normal' blue forms it is never the less very beautiful...