indentify volunteer flower?

[Myrmecodia]

Can anyone I.D. this plant that appeared in our woodland garden in central North Carolina?

-- Flowers -- leaf

The plant produced a rosette of leaves last year, vanished during the winter, and reappeared with a 3-4 foot stem this year. It gets some sun around mid-day but is otherwise shaded by mature deciduous trees. I have no idea whether it is a wildflower or an escaped garden variety.

I suspect it might be a Campanula or something similar, but I can't find anything that matches exactly.

Thanks.

[Twobtold]

Looks loke Campanula rapunculoides

[gregpresley]

[Myrmecodia]

Thanks for the information. Most of the photos I found of C. rapunculoides showed leaves with much smaller "teeth" than our plant. Is that a variable trait? If it is C. rapunculoides, I'll certainly try to eradicate it. I wouldn't want it to choke out the Tipularia discolor and Stylophorum diphyllum

[Myrmecodia]

I just looked at some more pics of Campanula rapunculoides. They all show a plant with flowers widely spaced on a long terminal inflorescence. My plant has flowers in clusters at the leaf axils along the length of the stem.