Charles Darwin described it as the most complex mating system in the natural world. Famed statistician Ronald Fisher was fascinated by it. And this episode’s interviewees braved 40 °C heat and caimans to unravel some of its mysteries. What is it? Tristyly — a rare and mysterious plant mating system. Tune in to hear what Dr Nicolay Cunha and Prof. Spencer Barrett learnt about this system from the pickerel weeds of Brazil’s Pantanal.

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