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Keyed in multiple places:

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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.

Key to Carex, Key C: Subkey in Carex

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..2 Lateral spikes usually pedunculate; lowermost inflorescence bracts sometimes with sheath; peduncles with prophyll at base.
....3 Terminal spike gynecandrous, pistillate flowers as many as or more numerous than staminate; lateral spikes short, not much longer than wide; fresh perigynia white-pulverulent
....3 Terminal spike usually staminate or, sometimes, gynecandrous, staminate flowers then more numerous than pistillate; lateral spikes oblong, distinctly longer than wide; fresh perigynia green or slightly glaucous.
..2 Lateral spikes sessile; bracts sheathless; peduncles without (or rarely with) a prophyll
..........6 Perigynia papillose (visible at 20× magnification).
image of plant
Show caption*© Scott Ward
............ 7 Terminal spike staminate or gynecandrous (if gynecandrous, the pistillate flowers more numerous than the staminate); lateral spikes not much longer than wide
............ ..........12 Margins of perigynia flat, at least in the upper ½, flat portion (measured at the tip of the achene and base of beak) > (0.1-) 0.2 mm wider
............ ............ 13 Achenes rounded at apex (style dehiscing at the surface of the achene); style conspicuously enlarged at the base
............ ............ 13 Achenes with short apiculus formed by the persistent base of the style; style not conspicuously enlarged at base
............ ..........12 Margins of perigynia rounded, or with flat portion < 0.1 mm wide.
............ ............ ..14 Margins of perigynia rounded or with a very narrow rounded edge; achenes nearly filling the perigynium bodies
............ ............ ..14 Margins of perigynia sharply edged or narrowly winged; achenes distinctly smaller than the perigynium bodies.
............ ............ ....15 Inflorescences in fruit 1.5-2 (or more)× as long as wide.
............ ..8 Terminal spike androgynous (rarely entirely staminate or entirely pistillate); lateral spikes androgynous, staminate, or pistillate.
............ ....9 Sheath fronts of lower cauline leaves transversely rugose.
............ ......10 Perigynia mostly < 2× as long as wide, widest near middle.
............ ........11 Inflorescence usually branched, at least at the base, usually with > 15 spikes; pistillate scales usually yellow or brown, sometimes with hyaline margins, 3-veined
............ ....9 Sheath fronts of lower cauline leaves smooth (or very weakly and indistinctly transversely rugose).
............ ............ ..........18 Fronts of leaf sheaths dotted red, brown, or yellow.
............ ............ ............ 19 Perigynia widest near the middle; culms usually < 1 mm wide.
............ ............ ..........18 Fronts of leaf sheaths not dotted red, brown, or yellow.
............ ............ ............ ......22 Upper leaves of culms with front of sheaths green-veined, not differentiated from the rest of the sheath
............ ............ ............ ......22 Upper leaves of culms with front of sheaths with at least a narrow hyaline or whitish-hyaline band extending at least ½ the length of the sheath.
............ ............ ............ ........23 Perigynia without a flat margin, or with a flat margin < 0.1 mm wide; plants short-rhizomatous or inconspicuously rhizomatous, cespitose or not, sometimes forming large colonies.
image of plant
Show caption*© Scott Ward
............ ............ ............ ............ ..26 Spikes consistently androgynous, occasionally some of the lateral spikes entirely pistillate.
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