200 CYPERACEAE 
XXII. SYLVATICA 
Perigynium firm, strongly several-nerved ; scales a 
h reddish- brown; upper sheaths 'puberulent at 
Perigyni ium glabrous, strongly ribbed, subcoriaceous, 
the beak thickish, flattened. 
Perigynium pubescent, strongly puris submem- 
ra 
Perigynium membranous, light Heels p^ ales hya- 
DE. with green mid-rib or somewhat reddish- 
wn-tinged: upper sheaths not pubescent at 
Seales cuspidate or awned, the midvein extendin ng 
o the tip: perigynium hispidulous, short-stipi- 
no the beak sharply but unequally bidentate: 
sterile shoots aphyllopodic 
Scales obtuse, E at apex, the midvein not ex 
E m PE to tip: perigynium normally glabrous, 
i ví apex more or less cleft: ques 
HS hyaline margine, rounded on 
Perigyni mm. long, green, the be uk less 
subulate, desi bidentate, oe or not at all 
obliqu ely cleft, hyaline betw the teeth: 
Scales tawny-tinged, sharply kee Je 
XXI LONGIROSTRES 
Represented by one species in our range. 
, V. VIRESCENTES 
Perigynium densely pubescent: lower spikes distant, 
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Leaves exceeding culm: lowest bract setaceous, 0.5 
mm. wide: pistillate spikes oblong-cylindric: peri- 
gynium obovoid. 
rum exceeding leaves : lowest bract leaflet-like, 0.5- 
wide: pistillate spikes linear-cylindric : 
s devenit ium ellipsoid. 
Perigynium glabrous at least at maturity: spikes con- 
tiguous, sessile or nearly so: ligule shorter than 
wide or at least not longer 
Perigynium much flattened, rou nded at apex, lightly 
nerved: tip of achene straight or little henr, 
Leaf-blades glabrous, stiff: perigynium granu 
sh ort-pointed at apex, coarsely nerved or rib- 
bed: tip of achene very abruptly bent. 
Perigynium 2 mm. lon rownish-green : scales 
pilose, not rough- AET leaf-blades 
sm pa 
Perigynium 2.5-3.5 long, green: scales 
rough- aa Eee pilose above: leaf- 
blades 
XXV. ANOMALAE 
Represented by one species. 
XXVI. ATRATAE 
Terminal spike staminate: lateral spikes slender- 
stalked, the lower droo oping: pistillate scales obtuse 
or acute, shorter than perigynia. 
Terminal spike gynaecandrous: lateral spikes short- 
ssa or sessile, erect: pi s ae strongly 
wned, normally exceeding perigyn 
XXVII. SHORTIANAE 
Represented by one species. 
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99. 
100. 
. C. oblita. 
. C. venusta. 
. C. allegheniensis. 
. C. Barrattii. 
C. debilis. 
. C. flezuosa. 
. C. cherokeensis. 
. C. Swanii. 
. C. virescens. 
. C. complanata. 
. C. hirsutella. 
. C. caroliniana. 
. C. Bushit. 
. C. scabrata. 
C. Buzbaumi. 
C. Shortiana. 
