 Sycamore trees produce their flowers in hanging branched clusters known as panicles that contain a variety of different flower types . Most are morphologically bisexual , with both male and female organs , but function as if they were unisexual . Some are both morphologically and functionally male , others morphologically bisexual but function as males , and still others are morphologically bisexual but function as females . All of the flower types can produce pollen , but the pollen from functionally female flowers does not germinate . All flowers produce nectar , the functionally female flowers producing it in greater volume and with a higher sugar content . 
