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
Perianth scales often numerous but always with 2 lateral ones keeled or at least concave; usually a number of flat ones inside these lateral scales
Spikelet solitary, globular or subglobular. Nut with 8 prominent ribs. Glumes loose; perianth scales ± exserted from the glumes Chorizandra
Inflorescence globular; base of bract scarcely enlarged and not sheathing the spikelet. Leaves up to 60 cm long, c. 2 mm diam. Flowers flat. Glumes acute-acuminate. 2 outer perianth segments keeled; inner ones spathulate, acuminate, flat. Coast. Swampy places Chorizandra sphaerocephala