Variation in tolerance to heterospecific pollen from a non‐native congener depends on co‐existence history of maternal and paternal source populations

Our results suggest that individuals from sympatric populations may mitigate the negative effects of HP caused by hybrid seed formation. Furthermore, the variation in tolerance to the inhibition of conspecific fertilization by HP could be attributed to the recipient and CP donor origins. But the unexpectedly high susceptibility of sympatric populations to HP highlights the complex ecological and evolutionary factors that influence HP tolerance.