GENUS 18. 



SEDGE FAMILY. 



20. Carex Leavenworthii Dewey. Leaven-worth's Sedge. Fig. 887. 



Carex Leaven-worthii Dewey, Am. Jour. Sci. (II. ) 2: 246. 

 1846. 



C. cephalophora var. angustifolia Boott, 111. 123. 1862. 



Similar to the preceding species but smaller, culms 

 very slender or almost filiform, erect or spreading, 

 roughish above, 6'-2o' tall. Leaves much narrower, 4"- 

 13" wide, mostly shorter than the culm; bracts of the 

 lower spikes short and bristle-form or wanting; spikes 

 4-7, androgynous, only the lower distinguishable, densely 

 crowded in a short oblong head 4."-?%" long, similar to 

 that of C. cephalophora but usually smaller; perigynia 

 orbicular-ovate, broadest near base, i"-ii" long and 

 f"-|" wide, narrowed into a 2-toothed beak, one-fourth 

 length of body; scales ovate, acute or short-cuspidate, 

 much shorter and narrower than the perigynia ; stigmas 2. 



In meadows, Ontario to District of Columbia, Iowa, Louis- 

 iana, Arkansas and Texas. May-June. 



21. Carex gravida Bailey. Heavy Sedge. Fig. 888. 



Carex gravida Bailey, Mem. Torr. Club i : 5. 1889. 



Light green, culms slender, ii-3 tall, sharply 

 3-angled, erect, rough above. Leaves flat, ii"-7" wide, 

 equalling or shorter than the culm; sheaths loose, con- 

 spicuously septate-nodulose, as are lower part of blades, 

 the whitish part membranous, little if at all transversely 

 rugulose; ligule prominent; bracts inconspicuous; 

 spikes androgynous, several, in an oblong or ovoid- 

 oblong dense head f'-ii' long, pale, subglobose ; peri- 

 gynia flattened, spreading, dull green or light brownish- 

 tinged, broadly ovate or suborbicular, ii"-2" long, i"- 

 ii" wide, rounded at the base, narrowed into a 2-toothed 

 beak, scarcely one-third as long as the body, several- 

 nerved on the outer face or nerveless ; scales ovate- 

 lanceolate, dull green or brownish-tinged, acute to 

 short-awned, about as long as the perigynia; achenes 

 with suborbicular face, i" wide; stigmas 2. 



Ohio to North Dakota, south to Kentucky. Missouri and 

 Indian Territory. May-July. 



22. Carex cephaloidea Dewey. 



Thin-leaved Sedge. 



Fig. 889. 



Carex muricata var. cephaloidea Dewey, Am. Jour. Sci. 



^ ii : 308. 1826. 



Carex cephaloidea Dewey, Rep. PI. Mass. 262. 1849. 



Dark green, with green and white mottled sheaths; 

 culms slender or stoutish, erect but not stiff, very rough 

 above, 2-3 tall. Leaves flat, 2"-^" wide, thin and 

 lax, somewhat shorter than the culm, the lower part 

 septate-nodulose as are the loose membranous occa- 

 sionally transversely rugulose sheaths ; bracts usually 

 not developed ; spikes 4-8, androgynous, subglobose, 

 aggregated in an oblong cluster g"-2o" long; peri- 

 gynia ovate or ovate-lanceolate, deep green, nearly 

 2" long, i" wide, ascending, sharp-edged, nerveless or 

 faintly few-nerved, tapering into a rough 2-toothed 

 beak about half as long as the body; scale ovate, mem- 

 branous, short-cuspidate or awned, about one-half as 

 long as body of the perigynium; stigmas 2. 



Woods and thickets. New Brunswick to Wisconsin and 

 Pennsylvania. Local. May-July. 



