New plant for my site and completely stumped

[awarner]

Bit if an unusual one for me, have two of these small plants growing in the nature reserve I look after but cant seem to pin down what it is.
So it has a very thin stem that feels square so thinking mint/ dead nettle family.
The leaves look more like gypsywort but that has different flowers.
Closest I have found is cushion calamint but it only has a single flower cluster at the top of the stem and the flowers are not quite the same as stock images I have found. The other was wild basil but the leaves are completely wrong.
I’ve also tried the botanicalkeys website but no luck as yet.
Any thought?

 

[uncleboob]

Bit if an unusual one for me, have two of these small plants growing in the nature reserve I look after but cant seem to pin down what it is.
So it has a very thin stem that feels square so thinking mint/ dead nettle family.
The leaves look more like gypsywort but that has different flowers.
Closest I have found is cushion calamint but it only has a single flower cluster at the top of the stem and the flowers are not quite the same as stock images I have found. The other was wild basil but the leaves are completely wrong.
I’ve also tried the botanicalkeys website but no luck as yet.
Any thought?

Bishops wort?

https://wildseed.co.uk/species/view/132

 

[nitrambur]

My plant ID app says Betony

 

[awarner]

What is throwing me was the single cluster of flowers, and the plantsnap app I sometimes use had so many images of different types I do not trust it.
Betony is probably going to be the closest, cheers.