Ok, for now it will be B. rothschildianum. Sorry Daisy: I had not taken a photo of the complete plant. The arrangement was awkward and I knew by head I had that picture in my database anyway... NOT. Memory...
At least it made clear that my doubt on B. longiflorum are sustained, as are my doubts on Elizabeth.
So: THANK YOU all for your help and thoughts!!
Regards,
Ruud
