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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Carex, Key A: Subkey in Carex

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1 Leaf blades 20-60 mm wide, without a midrib (with 40-100 parallel nerves all of equal prominence), leathery, the apex obtuse; leaf margin scarious, minutely crisped-ruffled (feeling scaberulous to the touch)
1 Leaf blades 0.5-25 (-52) mm wide, with a midrib, herbaceous, the apex acute; leaf margin various (smooth or scabrous, but not as described below).
..2 Spike entirely staminate.
....3 Culms yellow to brown or black, without red or purple coloration.
......4 Culms shorter than the leaves; widest leaf blades > 2 mm wide
......4 Culms longer than the leaves; widest leaf blades < 2 mm wide
..2 Spike pistillate or with both pistillate and staminate flowers.
........5 Stigmas 2; achenes lenticular.
..........6 Perigynia minutely but strongly and regularly serrulate on apical portion and beak, ± flattened; plants cespitose
........5 Stigmas 3; achenes trigonous.
............ ..8 Spikes androgynous or entirely pistillate; beak of perigynium with apex entire, emarginate, or with teeth < 0.2 mm long.
............ ....9 Lower pistillate scales < 10 mm long.
............ ......10 Perigynium beak < 2 mm long, or if more, then tapering to the perigynium body and shorter than the body.
............ ........11 Perigynia < 4× as long as wide.
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