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My project aims to compare the degree of autonomous selfing in populations of P. cuspidata which are sympatric and allopatric with P. drumondii. Specifically, I aim to investigate whether there is a shift towards earlier and more autonomous selfing in sympatric populations of P. cuspidata compared to allopatric populations, constant with reinforcement favoring traits that reduce hybridization in sympatry. Towards this, I will observe the anther dehiscence time and other salient features such as anther-stigma distance that are crucial for effective autonomous selfing in P. cuspidata populations from throughout the range.