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Cellular features of the flower materials. Bar = 100 mm. ((A)–(C), (G)–(I) and (J)–(L)) the abaxial, adaxial and cross section of the background petals of P. rockii, P. ostii and the F1 progeny, respectively; ((D)–(F) and (M)–(O)) the upper epidermis, lower epidermis and cross section of the background petals of P. rockii and the F1 progeny, respectively.
