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Changes in concentrations of individual leaf surface flavonoids during leaf development in B. pubescens ssp. pubescens (A), B. pubescens ssp. czerepanovii (B) and B. pendula (C). Each symbol represents clone-specific means for B. pendula (n = 5), provenance-specific means for B. pubescens ssp. czerepanovii (n = 5) and ssp. pubescens (n = 2).
