Melampyrum nemorosum has no English name. The Swedes call this plant "Day and Night", in Poland it is called Pszeniec Gajowy. The new leaves are blue, turning green as they mature.
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@beryl Oh thank you! But this is not that plant. The field cow-wheat (Melampyrum arvense) is in the same family as Melampyrum nemorosum, but has completely different leaves. There are 8 species of this plant in Poland. An interesting fact is that their seeds are spread by ants.
@haskar Thanks for correcting me - the flower looks just the same !! Perhaps it does not grow in the UK !! Although search on line refers it to Wood Cow wheat!