|Garden Solomon's Seal, Polygonatum x hybridum. On the railway embankment, 18 May 2013.|
We know this is the garden variety of Solomon's Seal because there are two ridges on the stems. There is a wild species with round stems and one with four ridges, and this is a cross between them.
According to WIkipedia, the plant got its common name because depressions in the root look like royal seals; or alternatively, that the cut root resembles a Hebrew character. I see no such depressions in photos of the roots on line. I think imagination has been at work; perhaps in giving it its name, and certainly in thinking up explanations for it.