Tufted perennial 2-6 dm; stems smooth, scarcely thickened at base; lvs flat, soft, 3-6 mm wide; bracts 4-10, the longest surpassing the infl; rays 3-8, to 10 cm; spikes subglobose, 8-15 mm; spikelets 3-6-fld, to 10 mm, radiating in all directions from the short axis, deciduous at maturity; scales ovate, acute, 2.5-3 נ1-1.5 mm, multinerved; rachilla broadly winged; achenes trigonous, 1.3-1.7 mm, half as thick. Dry soil; trop. Amer., n. mostly on the coastal plain to N.J. and in the interior to Mo. (C. echinatus and C. globulosus, both misapplied)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.