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Comparison of seed set (ratio of normally developed seeds to the total number of achenes) in native Taraxacum japonicum between conspecific pollination (white bars) and mixed pollination (pollination by both conspecific and alien pollen grains, black bars) at (A) HB in 2013 and (B–D) OU in 2012–2014, respectively. Error bars show 95 % confidence intervals.
