Cyperaceae
Leaf sheath closed or rarely open and then the perianth reduced to bristles or minute scales Cyperaceae
Flowers bisexual or unisexual but never enclosed in a utricle and never apparently separated into unisexual spikelets
Spikelets with more than 2 perfect flowers
Base of style dilated
Stylar base deciduous, not persistent on the nut
Stylar base persistent on the nut