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Key to Carex, Key F: Subkey in Carex
Cyperaceae
Carex
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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39620
2 Perigynia > 4× as long as wide (8-15 × 1-3 mm).
3 Apical teeth of perigynium beak erect; achenes oblong-obovoid or obovoid; at least proximal pistillate scales with 3-5 (-7)-veined center
3 Apical teeth of perigynium beak reflexed; achenes elongate; pistillate scales with 1-veined center
2 Perigynia < 4× as long as wide.
4 Perigynia > (9-) 10 mm long.
6 Perigynia 7-11-, 5-12-, or 12-25-veined
6 Perigynia 12-34-veined.
4 Perigynia < 10 mm long.
11 Perigynium body ovoid or lanceoloid or ellipsoid, widest at middle or proximally; proximal bract usually < 2× as long as the inflorescence.
17 Leaf blades variously hairy.
18 Plant brown or black at base
18 Plant with at least some red or purple at base
29 Perigynia with veins slightly prominent
35 Widest leaf blades < 10 mm wide.
42 Perigynia with more than 12 veins.
44 Perigynia with more than 2 veins extending most of length of bodies.
49 Perigynium with not more than 5 veins extending length of body on abaxial face, veinless or weakly veined on adaxial face
49 Perigynium with > 8 equally prominent veins on both faces.
50 Perigynia bluntly angled in cross section
50 Perigynia sharply angled in cross section
51 Pistillate spikes, at least the proximal, lax, proximal and middle perigynia separated by internodes at least 1/4 their length; leaves and sheaths not septate-nodulose
51 Pistillate spikes dense, proximal and middle perigynia separated by internodes less than 1/10 their length; proximal leaves and sheaths sparingly septate-nodulose.