I remember picking up the seeds of this nearly twenty years ago in some public garden or other. Peony seeds are always irresistible to me. It is difficult to know what to call the delavayi type peonies - the nomenclature has changed over the years. P.delavayi itself was always the tall red one. Then there was the big yellow one, usually named P.lutea ludlowii, and a couple of smaller semi herbaceus types - potaninii (red) and trolloides (yellow). Then for a while I think they were all included in delavayi as varieties or subspecies. Now it seems, at least according to The Plantfinder, that trolloides and lutea are forms of delavayi, as is potaninii but under the name angustiloba. Only ludlowii is a species in its own right.