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I'm sure this is not Lamium purpureum, the leaves are too narrow and unstalked and the flower shape also doesn't fit. I'm not entirely convinced about Stachys palustris either, though! An odd one.
Thanks for your comments and ids, both. I'm reassured that landgirl thinks this may not be Stachys palustris as I did agonise a bit over whether it might be this, but rejected it on the grounds of the flower 'spike', or absence thereof. Equally, I knew the leaves weren't exactly right for Lamium either, but you've got to start somewhere, so we'll see what happens...
The flower looks very similar, bit more convinced now.
Yes, thanks, Lavateraguy. I'm still concerned about the absence of a flower 'spike', however!
... I wonder, from the unhealthy look of the leaves, whether it has had an encounter with a herbicide, but unless the field has been treated with a broad-leaved weedkiller this doesn't seem all that likely.
The observation I cited from last year was a marsh woundwort lacking the usual spike, though not to quite the same degree.
The location was basically waste land running alongside the river. I don't think there would be any sort of intervention in the form of weed killer or anything else (no mowing, etc.). So an oddity, but thanks for all your help. I do value it.
... does successfully mimic the jizz of Lamium purpureum, and I was initially fooled, until Graeme drew my attention to the leaves.
The plant does not show the typical appearance of Stachys sylvatica, but there doesn't seem to be another candidate among the British labiates.
OK, I give in!!
Lat/Lng: 53.577219, -2.312247
OS grid ref: SD794090