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Keyed in multiple places:

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Key to Carex, Key B: Subkey in Carex

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1 Widest leaves 4-8 mm wide; inflorescences more-or-less capitate (occasionally with the lowermost 1 or 2 spikes separated
1 Widest leaves 1-4 mm wide; inflorescences ovoid to cylindric

Key to Carex, Key C: Subkey in Carex

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1 Perigynia surfaces and beak often pubescent, finely papillate
1 Perigynia glabrous, papillate or not.
..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.
......4 Pistillate scales obtuse to acuminate or cuspidate.
........5 Perigynia often papillose over most of the surface; style deciduous
..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, androgynous, or gynecandrous (if gynecandrous, the staminate flowers more numerous than the pistillate); lateral spikes at least 2× as long as wide
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
..........6 Perigynia smooth.
............ ..8 Terminal spike gynecandrous; lateral spikes gynecandrous or pistillate.
............ ..........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.
............ ............ ......16 Lowermost perigynia in each spike ascending or erect.
............ ............ ........17 Perigynium serrulate on the margins of the upper body and lower beak
............ ............ ........17 Perigynium entire on the margins of the upper body and the lower beak
............ ..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 the base
............ ......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
............ ........11 Inflorescence unbranched or with 1 or 2 short branches at the base, with < 15 spikes; pistillate scales greenish hyaline, 1-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.
............ ............ ............ ..20 Plants densely cespitose, with short rhizomes; pistillate scales acute to acuminate
............ ............ ............ ..20 Plants loosely cespitose, sometimes with long rhizomes; pistillate scales (at least the upper) obtuse
............ ............ ..........18 Fronts of leaf sheaths not dotted red, brown, or yellow.
............ ............ ............ ....21 Perigynium beak > 0.25 mm long, the margins often serrulate.
............ ............ ............ ......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 with flat, winglike margins > 0.1 mm wide; plants long-rhizomatous, not cespitose, sometimes forming large colonies
............ ............ ............ ........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.
............ ............ ............ ..........24 Plants colonial from long rhizomes or stoloniferous (proliferating from last year’s decumbent sterile culms)
............ ............ ............ ............ 25 Plants long stoloniferous, proliferating from last year’s decumbent sterile culms
image of plant
Show caption*© Scott Ward
............ ............ ............ ............ ..26 Spikes not consistently androgynous, the terminal either entirely staminate or pistillate, the lateral spikes irregularly pistillate, or staminate, or mixed
image of plant
Show caption*© Scott Ward
............ ............ ............ ............ ..26 Spikes consistently androgynous, occasionally some of the lateral spikes entirely pistillate.
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