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Looking at Olga's pictures I started doubting if my favourite peony is really wittmanniana as I got it
We have an annual discussion about this every year when I post a picture of it. When I bought it as a little seedling it was labelled Paeonia anomala. Some Forumists considered it to be P. veitchii, whilst others thought P. anomola ssp veitchii. About a month later than last year.
First P delavayi and delavayi lutea. The lutea specimen is more than 3 meter tall. (Attachment Link) (Attachment Link) (Attachment Link)
The yellow one might well be Paeonia ludlowii if it usually has just one carpel per flower, rarely two.
Did you collect the seed from the tall P. ludlowii? Then it would be a cross of course, but I can't remember having heard of a cross between P. ludlowii and P. delavayi.