Phytochemical and biological investigations on Centranthus kellereri (Stoj., Stef. & T. Georgiev) Stoj. & Stef. and C. ruber (L.) DC. and their potential as new medicinal and ornamental plants.

Since the interaction effect of population and extraction method was highly significant ( p -value < 0.01) for all four response variables ( Table 11 ), multiple means comparison was done to compare the nine combinations of population and extraction method using the lsmeans statement at the 5% level of significance ( Table 12 ).

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