Whitebells ?

Whitebells ?

Observation - Whitebells ?. Description: The leaves, stalks and flowering pattern is very much like bluebells, though the shape of the bell does not seem quite right and of course it is white with a dark greenish line down the inside of the bell. The bell was straighter than bluebell which cu

The leaves, stalks and flowering pattern is very much like bluebells, though the shape of the bell does not seem quite right and of course it is white with a dark greenish line down the inside of the bell. The bell was straighter than bluebell which curl at the tips. I know there is a white version of bluebell.
It may be a domestic escapee.