I came across, growing by a canal, a comfrey which was lower growing,
and with different coloured flowers, from the usual Symphytum x
uplandicum (Russian Comfrey). At the time I thought it was Symphytum
tuberosum (tuberous comfrey), but on checking my books it seems a less
that exact match.

http://www.stewart.hinsley.me.uk/Images/Symph24.jpg
http://www.stewart.hinsley.me.uk/Images/Symph24.jpg

Any opinions?

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Stewart Robert Hinsley