The catkin appears to be an example of convergent evolution; this reproductive mechanism evolved at least twice, once for the order Fagales (oaks, hazel, alder) and again for Salicaceae (willow, cottonwood).
Read MoreThe catkin appears to be an example of convergent evolution; this reproductive mechanism evolved at least twice, once for the order Fagales (oaks, hazel, alder) and again for Salicaceae (willow, cottonwood).
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