pistachio flowers pistachio flower _ Pistachios fruit are dioecious with male and female flowers on separate trees. pistachio flower [caption id="attachment_9748" align="aligncenter" width="1500"] pistachio flower[/caption] pistachio flower : Male and female trees must be present for fruit to set, or a branch from a male tree may be grafted on a female tree. The small, brownish-green flowers are without petals and are borne on axillary racemes or panicles in early...