Someone helpfully suggested it might be lemon balm. It does look almost exactly like the pictures I subsequently saw of lemon balm. The only difference, near as I can tell, is the placement of its flowers. Any greenthumbs in the audience are certainly welcome to help me account for that inconsistency, though!
I have grown lemon balm, and it is not that. The flowers and leaves aren't quite right. The acid test: if you rub a leaf, lemon balm has a distinct lemon fragrance, not minty.
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Thanks, Van. :)
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