Freshwater marsh with sedge species in zones defined by depth of water

Carex - photo from above showing 3-ranked leaves

Cyperus - inflorescence of many spikelets, each flattened and with 2-ranked arrangement of florets

Carex - Inflorescence of few spikelets, the uppermost male only, the lower ones female only

Carex - fruits with achene surrounded by sac-like perigynium