(S) C. filifolia Nutt. -___ Densely tufted, the culms 10-30 
em, tall, wiry, slender, smooth, bluntly angled, the basal sheaths 
splitting into fibrils, the old sheaths persistent, brown and conspicuous, 
the leaf-blades about as long as the culms, o> less than 1 mm. 
thick, very sharp, wiry; spikes solitary, bractless, 25 mm. long, 
slender, the staminate flowers borne in the upper half, the pistillate 
flowers few, their scales broadly ovate the 
nspicuous hyaline margins, conce : 
tapering in the 
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ower part, 
obovoid, 5 mm. long, thin, hirtellous, 
tapering above to a beak scarcely .5 mme long. 
To be expected in dry soil in the prairie region. 
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C. aurea Nutt. -—_____-__» Rootstocks slender, whitish, 
elongated, the culms 15-30 cm. tall, smooth or nearly so, triangular, 
slender, leafy; leaf-blades soft, flat, 2-3 nm. wide, mostly smooth; 
staminate spikes solitary, sessile or shortly stalled, 5-8 m. long, 
is5-2 mm. thick, tapering at both ends, sametimes bearing a few 
pistillate flowers at the apex; pistillate spikes 3-5, usually approx 
imate, the upper tending to be sessile, the lower on slender stalks 
often as long as the spike, 8-15 mm. long, 3-5 mm. thick, loosely 
flowered, the flowers rarely more than 15; bracts sheathing the lowermost 
longer than the inflorescence; scales ovate to rotund, thin, brownish, 
sometines mucronate; perigynia obovate, plump, dull green becaning 
brown or yellowish at maturity, glabrous, 4-3 mm. long, beakless. 
Upper Priest R., 3000 ft., Bpling 7569. 
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