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Hi John ,to your question for P. suff.v. spontanea .....this seems to be a minefield .......I will try it and I will write from the book of I. Rieck :P. s. v. spontanea was collectet from Purdom 1910 anddescriptet from Rehder -Hong Tao was the opinion that this is a hybrid and he found a similar plant which he descriptet as P.jishanensis ( 1992 ) -later after some critic from his collegues has he tried to rename this plant as P. s.v. spontanea - but some people disagree. Later after some research of the pollen morphologie ( Hond de Yuan + Pan Kai-yu 1999 ) was P. jishanensis guilty .Stephen How ( 2001 ) has now in year 2001 tried to rename all to P. spontanea ( he thinks that the old material from Purdom has priority ).....thats the end of the story ( so far I know )The first treepeony which ever was descriptet ( Andrews 1804 )was P. suffruticosa ...but this was a plant with double flowers ( flore plena ) ....so Andrews has descriptet a hybrid !Now to your pic of your plant : I have it compared with my plant of P. jishanensis .....but it looks different !
Lucky Kerstin in Uppsala!