I know there are imposters let's hope this one is genuine!
SOLVED: Is this Solomon\'s seal?
After further inspection it appear it is in fact an imposter but apparently the imposter has medicinal value as well so it will stay.
I found a genuine one but it is informed. A tree branch fell on it so extraction will have to be delicate. The stem is bent but not broken and all the foliage still green so perhaps a split will remedy it.