Much like no. 23 [Cyperus grayi Torr.]; rachilla wingless; scales subremote, barely reaching the base of the next scale above; achenes 2-2.4 mm; 2n=ca 166. Rare and local; sandy prairie blowouts in c. and nw. Ill.; disjunct to sandy places in Tex. and La.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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