I visited the SRGC Forum page yesterday to put there a question regarding the three little Trilliums. At that occasion I found there my question from December regarding Campanula pestalozzae. I was very surprized. I completely forgot that I put sometimes such a question (I am 71 and my memory is not too good).
The Centaurea pestalozzae I grew seven years ago as an unidentified plant. It died after its first flowering and was very nice (I attach a picture here).
In the meantime I got a tip that it could be C. pestalozzae. I have received recently several seeds of it and that was the reason of my question to the Forum. I am sure now that it really is C. pestalozzae.
Zdenek Rehacek