This is actually Asarum caudatum, though it arrived as A.arifolium.
The true apecies has silver marked evergreen leaves, and comes from the south-eastern USA. I was sent a small piece of stem of the real thing, by a supplier in the UK,
but it had been dead for a long time before it got to me!
In a bizarre twist of fate, my A.caudatum turned out to be a white flowered form, so this is the only brown flowered form I have.