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1 Perianth bristles absent; achenes 1.2-1.6 mm long, transversely rugose; plants bearing solitary pistillate (amphicarpic) flowers enclosed in the basal leaf sheaths, these differing in many ways from the “normal” flowers of the terminal inflorescence; [section Schoenoplectiella].
..2 Achenes nearly equilaterally sharply trigonous; styles all 3-fid
......4 Culms 1-2 mm thick, cylindric in ×-section.
........5 Achenes 1.75-2.0 mm long, unequally biconvex (rounded on both faces, but less so on one than the other), rounded-obovate, broadly cuneate at the base, rounded at the apex.