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The flowers of the chemically investigated nine species of the genus Paeonia. (a) P. albiflora; (b) P. delavayi; (c) P. emodi; (d) P. japonica; (e) P. lactiflora; (f) P. obovata; (g) P. peregrina; (h) P. suffruticosa; (i) P. veitchii. (https://it.wikipedia.org/wiki/Paeonia).
