Motherwort

This plant was new to me although I have noticed more of these square-stemmed plants.  It appears to be Motherwort ( Leonurus cardiaca ) and reminds me, not well, of a stinging nettle.  The flowers are quite pretty, though, up close.  They occur just above the leaves, which stick out of the square stem at intervals of a few inches, two at a time.

motherwort-square-stem-flowers-at-leaves-summer

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