212 



CYPERACEAE (SEDGE FAMILY) 



95. C. deflexa. 



96. C. albicans. 



, C. varia. 



C. varia, v. colorata. 



C. novae-analiae. 



k. Remnants of the old leaves persisting as stiff tufted 

 shreds; scales acuminate, sharp-pointed, nearly 

 or quite equaling the perigynia. 

 Perigynia 1.7-2.4 ram. thick. 

 Beak nearly or quite as long as the body of the 

 perigynium. 



Perigynia puberulent 98. C. 



Perigynia glabrous (98) C. umbell<tt<i. \. 



Beak one third as long as the body . (93) C. utnbellata, v. brevirostriA. 



Perigynia 1.3-1.6 mm. thick 94. C. nigro-marginata. 



k. Remnants of old leaves soft, slightly if at all shredded ; 

 scales blunt or acute, much shorter than the 



perigynia 



j. Culms elongate, none of them hidden at the base of the 



plant I. 



I. Perigynia much exceeding the scales ; spikes closely 

 approximate .... ... 



I. Perigynia nearly or quite equaled by the scales m. 

 m. Mature leaves 3-5 mm. wide (if exceptionally nar- 

 rower, the spikes remote) 97. C. communis. 



m. Mature leaves 1-2.5 ram. wide (if ^exceptionally 



broader, the spikes approximate). 

 Staminate and pistillate spikes all sessile. 

 Scales of pistillate spikes whitish or greenish . 9 



Scales purplish (98) 



Staminate and the lowermost pistillate spikes 



short-peduncled 9 



g. Culms leafy, the leaves elongate n. 

 n. Pistillate spikes sessile or subsessile ; basal sheaths fibrillose. 



Staminate spike overtopping the pistillate .... 154. C. re*1ita. 

 Staminate spike shorter than the pistillate . . . (154) C. vestita, v. Kennedyi 

 n. Pistillate spikes (or at least the lower) distinctly peduncled ; 



sheaths not fibrillose. - 



Leaves soft, ribbon-like, dark green, the lower bract ex- 

 ceeding the culm ; perigynia long-beaked . 

 Leaves firm, short, glaucous ; the bracts short ; perigynia 



barely beaked 



d. Perigynia glabrous o. 

 o. Leaves setaceous, basal ; culms setaceous, naked ; bracts reduced 



to pale tubular sheaths 



o. Leaves flat or plicate p. 



p. Leaves lanceolate, 1.5-3 cm. broad, firm and evergreen ; culms 

 slender, bearing numerous tubular colored sheaths and 



remote slender spikes 



p. Leaves linear or linear-lanceolate, less than 1.5 cm. broad q. 

 q. Perigynia beakless or with minute entire beaks r. 



r. Pistillate spikes mostly on capillary peduncles, wide-spread- 

 ing or drooping . 



. Scales brownish or purplish, nearly equaling or exceed- 

 ing the compressed short-tipped perigynia t. 

 t. Spikes globose to oblong-cylindric, rarely 2 cm. long ; 



scales exceeding the perigynia u. 



u. Scales long-attenuate with subulate tips, much ex- 

 ceeding the perigynia. 

 Scales dark brown or purplish throughout. 



Pistillate spikes 4-8 mm. long .... 111. C. paupercula. 

 Pistillate spikes 1-1 .6 cm. long . . (Ill) C. paupercula, v. irrigiia. 

 Scales green with pale-brown or yellowish margins 



(111) C. paupercula, r.jxitfMM 



u. Scales obtuse or acute, barely exceeding the perigynia. 

 Leaves involute, 0.5-1 mm. wide, glaucous ; scales 



brown 112. C. limosa. 



Leaves flat, 1-8 mm. wide, dark green ; scales 



imrple-black 118. C. rariflora. 



t. Spikes linear-cylindric, 2-5 era. long; scales barely 



equaling the perigynia 114. C. littoral ix. 



8. Scales whitish, much shorter than the sharply trigonous 



attenuate perigynia 115. C. pratsina. 



r. Pistillate spikes sessile or short-peduncled, erect v. 

 v. Plant glaucous, loosely stoloniferous; staminate spikes 



long-stalked, their scales mostly purple-brown. 

 Leaves 2.5-. r > HUM. wide, revolute in drying, harsh; 



culms harsh ; perigynia brown . . " . . . 103. C. glauca. 

 Leaves 1-3 mm. wide,' becoming plicate or involute, 

 smooth; culms smooth; periirvnia pale green or 

 whiti-h ......... 1M. 0. livida. 



v. Plant green, densely tufted ; staminate spikes sessile or 

 short-stalked, their scales pale brown or straw 

 color. 



150. O. scalrata. 

 103. C. glauca. 



117. C. elurnea. 



121. C. plantaginea. 



