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Keyed in multiple places:

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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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