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Keyed in multiple places:

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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.

Key to Carex, Key D: Subkey in Carex

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1 Pistillate spikes all or in part borne on the elongate, aboveground stem.
..2 Bracts of the lowermost non-basal spike with well-developed sheath > 4 mm long.
....3 Beak of perigynium entire, notched, or with indistinct teeth < 0.6 mm long.
......4 Bracts of the lowermost non-basal spike bladeless, or with a blade < 2 mm long.
......4 Bracts of the lowermost non-basal spike with blade > 3 mm long (and often much longer).
..........6 Achene tip with at most a short apiculus.
............ 7 Leaves usually glabrous, to scabrous on the veins.
............ ..8 Bases of plants distinctly red or purple.
............ ....9 Lowermost pistillate scales awned; leaves somewhat septate-nodulose; plants usually long-rhizomatous and forming large clonal colonies
..2 Bracts of the lowermost non-basal spike sheathless or with sheath < 4 mm long.
............ ..........12 Perigynium beak entire or with teeth < 0.6 mm long.
............ ............ ......16 Leaf sheaths (and usually the blades as well) pubescent.
............ ............ ..........18 Perigynia > 3.5 mm long, the tip tapering or abruptly beaked.
............ ............ ............ 19 Longer peduncles of pistillate spikes 0-1 cm long; perigynia < 3× as long as wide, abruptly contracted to a short stipe at the base.
............ ............ ............ ......22 Leaf blades glabrous on the upper surface, often with rough margins or tip; beak of perigynium straight.
............ ............ ............ ........23 Fronts of sheaths of lower leaves ladder-fibrillose; leaves and sheaths septate-nodulose (sometimes obscurely so)
............ ............ ............ ........23 Fronts of leaf sheaths not ladder-fibrillose, sometimes breaking into longitudinal fibers; leaves and sheaths not septate-nodulose.
............ ............ ............ ............ ..26 Leaf blades, at least toward the tip, M-shaped in cross-section when young, the upper surface usually with 2 marginal veins more prominent than the midvein; staminate spikes 1-4
............ ............ ............ ............ ..26 Leaf blades V-shaped in cross-section when young, the upper surface lacking 2 marginal veins more prominent than the midrib; staminate spike 1
............ ............ ............ ............ ......28 Plants with most pistillate spikes on obvious elongated stems; culms shorter than or longer than the leaves.

Key to Carex, Key E: Subkey in Carex

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1 Apex of perigynium beak with 2 teeth at least (0.4-) 0.5 mm long.
..2 Perigynia with 2 distinct marginal veins, otherwise veinless or only very faintly veined; leaves not septate-nodulose
..2 Perigynia with 5+ distinct veins; at least proximal leaves septate-nodulose, rarely not.
....3 Perigynia with serrulate wing on margins; spikes usually 20+, sessile, pistillate or androgynous and similar in appearance, forming a dense, ovoid or oblong head, rarely with proximal spike separated
....3 Perigynia without wing on margins; spikes not more than 10, usually at least proximal shortly pedunculate, sometimes subsessile, distal and proximal spikes usually dissimilar in appearance, usually not crowded into a dense head.
......4 Pistillate scales obtuse to acuminate, awnless or at most with a rough apiculus.
........5 Staminate spikes usually 1-3+; perigynia 6-15 (-22)-veined, each 4-10 (-12.5) mm.
..........6 Perigynia 14-25-veined
......4 Pistillate scales, at least some, with a scabrous awn.
............ ..8 Perigynia (9-) 10+ mm long.
............ ......10 Upper pistillate scales acute to short-awned, awn < ½ as long as the body.
............ ........11 Beak of perigynia with teeth often < 1 mm long.
............ ..........12 Staminate spikes 1-6; perigynium beak often < 1.7 mm long.
............ ............ 13 Perigynium veined to tip of body and often into beak; widest leaves mostly > 4 mm wide.
............ ............ ..14 Pistillate scales with margins serrulate distally; awn, when present, rough.
............ ............ ..14 Pistillate scales with margins entire; awn, when present, usually smooth.
1 Apex of perigynium beak entire, emarginate, or with 2 teeth < 0.5 mm long.
............ ............ ..........18 Perigynia minutely papillose, at least distally (at 20× magnification).
............ ............ ............ 19 Roots brown or black, without yellow-brown felty covering, rarely with white felty covering.
............ ............ ............ ............ ..26 Adaxial side of leaves with 2 marginal veins more prominent than midvein; young leaves M-shaped in cross section.
............ ............ ............ ............ ..26 Adaxial side of leaves without 2 marginal veins more prominent than midvein; young leaves V-shaped or rounded in cross section.
............ ............ ............ ............ ..........30 Leaves and/or sheaths pubescent, at least at junction of blade and sheath.
............ ............ ............ ............ ............ 31 Leaves < 8 mm wide, blades and usually also the sheaths pubescent.
............ ............ ............ ............ ............ ....33 Style persistent on achene in fruit; larger leaves and sheaths usually at least sparsely septate-nodulose, rarely not.
............ ............ ............ ............ ............ ............ ..38 Leaf blades, at least widest, M-shaped in cross section when young, adaxial surface with 2 marginal veins more prominent than midvein.
............ ............ ............ ............ ............ ............ ..38 Leaf blades V-shaped in cross section when young, adaxial surface without 2 marginal veins more prominent than midvein.
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