Bolboschoenus >

Leaves with distinct long laminas often as long as the culms Bolboschoenus
consider the other alternative
Styles mostly 3-fid (some flowers in each spikelet usually with 2-fid styles but the majority of flowers in each spikelet have 3-fid styles)
consider the other alternative
Leaves 5–8 mm wide. Nut glossy black; dorsal angle rounded or obtuse, ± lenticular. Perianth bristles c. half as long as the nut. Plant up to 2 m high. Coast. Lake margins, drainage ditches etc Bolboschoenus medianus