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Section Vulpinae
See list of 4 species in this sectionReference: Standley (2002).
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1a. Perigynia rounded and inconspicuously spongy-thickened at the base, adaxially without veins; sheaths red- or brown-dotted near the margins; achenes circular in outline
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1b. Perigynia truncate and conspicuously spongy-thickened at the base, with usually 7 veins adaxially; sheaths not dotted; achenes ovate
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2a. Leaf sheaths smooth, not corrugated, the summits firm, thickened, yellow, and truncate; leaf blades minutely papillose on the adaxial surface, epistomic; inflorescence 3–6 cm long
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2b. Leaf sheaths usually corrugated on surface opposite leaf blade (smooth in C. oklahomensis), the summits thin, fragile, colorless, and convex; leaf blades smooth on adaxial surface, not epistomic; inflorescence 5–15 cm long
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3a. Lowermost 2 or 3 leaves with highly reduced blades; leaf sheaths smooth, prolonged above the junction of the blade and forming a tube that surrounds the stem; stems firm; ligules obtuse, up to 4 mm long
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3b. Lowermost leaves usually with ± well-developed blades; leaf sheaths corrugated, not prolonged above junction of blade; stems weak, easily compressed; ligules acute, up to 10 mm long
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Each photo represents one species in this section.