Obviously not a bamboo, but that is the folk name I was given by the person who gave me the plant.
I've gotten as far as deciding that it is a Polygonatum of some sort.
Was wondering if anyone else has grown it, because I suspect it to be as invasive as witch weed/nut grass. I keep it in large pot - to afraid to let it loose in the garden. Would like to hear if anyone knows any more about it.