Campanula imposter

[Roma]

When these campanulas produced their first leaves I knew they were not thyrsoides and suspected rapunculoides.  The plants have been completely neglected in a 24 cell tray awaiting being thrown out.  I spotted this lovely white flower a few days ago.  Could it be a form of punctata?  Still invasive but more attractive than rapunculoides.

[arisaema]

C. takesimana? I grew it ages ago when it was first introduced by Thompson & Morgan, it's not as bad as C. punctata, but it's still sort of bad...

[TheOnionMan]

C. takesimana? I grew it ages ago when it was first introduced by Thompson & Morgan, it's not as bad as C. punctata, but it's still sort of bad...

Looks like C. punctata or C. takesimana to me. Here, C. punctata was horribly invasive, but after about 10 years of trying I finally got rid of it (it does not stand up too well to drought), however, takesimana is 10x as bad, probably my worst nightmare of an invasive weed, there is no way possible of controlling it at this point unless I pick up and move residence.  Today I was pulling spent flowering stems so at the least the dust-like seed will not spill, but there are hundreds upon hundreds of such stems, the plant now escaped into adjacent woodlands and adjoining properties.  But it's ability to spread far and wide by stringy underground runners, with even the slightest bit left behind to sprout 10 more plants like a many-headed medusa, presents the biggest threat.

[Roma]

Thanks Arisaema and Mark.
I will not plant it in the garden.  I've too many plants already which are trying to take over.

[Lesley Cox]

C. takesimana is VERY bad, once you dig it out especially, with every tiny scrap of root left behind, rushing into growth as a new plant and spreading at miles per hour it seems to me.