248 



CYPERACEAB (SEDGE FAMILY) 



518. C. scabrata. 



short-awned, exceeded by the plump subglobose or obovoid 

 strongly ribbed abruptly-beaked perigynia. (C. Joorii Bailey.) 

 Swamps and wet shores, Mo. to Fla. 

 and Tex. Aug. FIG. 517. 



150. C. scabrata Schwein. Rather stout, 

 very leafy, 2-8 dm. high ; culm sharply and 

 very roughly angled; leaves 6-18 mm. 

 broad, flat, very rough,- spikes 3-6, scat- 

 tered, the upper 1 or 2 sessile, the remainder 

 often long-peduncled and sometimes nod- 

 ding, 1-6 cm. long, narrowly cylindrical 

 and compactly flowered : perigynia broadly 

 ovoid, prominently few-nerved, rough, the 

 beak nearly as long as the body and 

 slightly toothed; scales acute and rough- 

 tipped, green-nerved, about as long as the 

 517. C. macrokolea. body of the perigyuia. Wet meadows 

 and glades, e. Que. to Ont., s. to the mts. 

 of S. C. and Tenn., O., and Mich. June-Aug. FIG. 518. 

 Hybridizes with C. crinita. 



151. C. filif6rmis L. Tall and very slender but erect, 

 0.5-1.2 in. high; culm obtuse, smooth; leaves very long, 

 involute-filiform, rough ; spikes 1-3, ses- 

 sile, somewhat scattered, erect, short and 

 thick, 1-5 cm. long, 5-7 mm. thick ; peri- 

 gynia very short-ovoid, the teeth very 

 short, the few nerves obscur a d by the dense stiff hairs ; scales 

 thin and blunt, about as long as the perigynia. Bogs and 

 shallow water, Nfd. to B. C., s. to Pa. and the Great Lake 

 region. May- Aug. (Eu.) FIG. 519. 



152. C. lanuginbsa Michx. Similar ; lower ; 

 culm mostly rough above ; leaves flat, 2-5 

 mm. broad ; spikes usually somewhat slim- 

 mer, the lowest usually peduncled ; scales 

 mostly sharper and longer. (C. flliformis, 

 var. latifolia Boeckl.) Swales and low 

 meadows, N. B. to Sask. and B. C., a. to Pa., 

 111., Kan., etc. June-July. 



153. C. Houghtbnii Torr. Stiff, 1.5-6.5 

 dm. high, extensively creeping; culm rather 

 sharply angled, rough, exceeding the leaves ; 

 leaves flat and very sharp-pointed ; spikes 

 1-3, sessile or the lowest 

 short-stalked, erect, varying 



from nearly globular to cylin- 

 dric, 1-4.5 cm. long, 7-12 mm. 



519. C. flliformis. 520. C. Houghtonii thic ^ compact ; perigynia 



short-ovoid, stiffly pubescent, 



prominently nerved and toothed ; scales thin-margined, acute or 

 owned. Dry sandy or gravelly soil, e. Que. to Athabasca, s. to 

 n. N. E., N. Y., Mich., and Minn. May-Aug. FIG. 520. 



154. C. vestita Willd. Stout and stiff, 3-8 dm. high, freely 

 stoloniferous ; culm sharply angled, smooth or somewhat rough : 

 leaves narrow and rather short, roughish ; staminate spike 1. 

 rarely 2, sessile or nearly so, 2-5 cm. long ; pistillate spikes 1-3, 

 subapproximate, or rarely the lowest subradical, often staminate 

 at top, ellipsoid or short-cylindric, 0.8-2.8 cm. long, compactly 

 flowered; perigynia ovoid, nerved, stiffly hairy, short-beaked, the 

 beak often purple and white-hyaline at the orifice, which becomes 

 more or less split with age ; scales thin and blunt or acute, shorter Ml. c. vestita. 



