londongarden writes

It's a "Southern Marsh Orchid".


For the benefit of those of us who are still struggling to learn how to
distinguish between the various species of Dactylorhiza, can you explain
why you think it is that and not a common spotted orchid? The pictures
I've seen of Southern Marsh all have a much tinier central tooth, and
they tend to be a more purplish pink.

--
Kay