196 CYPERACEAE 
Seale NIS to short-cuspidate, 25 to nearly 
Scale Due about half the length of the 
body of perigynium, the midvein not form- 
ing a sharp keel, obsolete or nearly so at 
ee 2 achene  orbieular, widest near 
Body of perig nium ovate to lanceolate, straw- 
colored AA maturity or often darker- “tinged ; 
beak half the length of the body or more. 
Body of perigynium noticeably es cceaiae the 
d a a oe leaf-blades 3-3.5 
sto 
Body of. ea © ualled or exceeded by 
the e sharp-pointed a: ve des 0.75- 
.(9 min. wide: culm slender. 
VIII. OvALES 
Perigynium narrowly to broadly lanceolate, at least 
22 times as long as broad, very thin and scale- 
ike. 
Leaf-blades at most 3 mm. wide, those of sterile 
shoots few, ascending. 
Leaf-blades broader, those of sterile shoots numer- 
ous, spreadi 
ice PO lanceolate or broader, at most twice 
ng a a 
Body of perigynium obovate (often broadly) broad- 
est at top, very aa beaked : lea deed 
green-striate ventrally nearly to th outh. 
Eee irs to short-acuminate : choc "Eesuilé 
ee perigynium 1.5-3 mm. 
Seales obtuse or acute: spikes silvery-gree 
culm stiff: perigynium witn body a 
ae s very short-beaked, the beaks not 
nspicuous at top of spikes 
Scales acute or ort acuminate : spikes not 
silvery-green: culm slender: perigynium 
with body truncate-rounded at apex, twice 
length of Bos the beaks conspicuous at 
top of spi 
Seales long-acuminate or aristate: achenes stipi- 
tate: perigynia 2.5—4 mm. broad. 
Body of erie ain ovate to SIBI HG. broadest at 
middle or base: leaf-sheaths conspicuously 
hyaline ventrally. 
peu 3-4 mm. long, strongly nerved ven- 
Perigynium-body ovate: leaf-blades 2.5-6 
base. 
Perigynium-body orbicular: leaf-blades 1.5- 
2.5 1 spikes mostly long-clavate 
at AER 
Perigynium 4- 6 mm. long, nerveless ventrally. 
erigynium plano-convex with suborbicular 
body 2.5-8.5 mm. wide: scales usually 
acute 
Perigynium very flat with reniform body 3.5- 
4.5 mm. wide: scales obtuse. 
IX. PHYLLOSTACHYAE 
po of perigynium oblong: pistillate flowers usually 
0. 
uA 2 perigynium globose: pistillate flowers usually 
X. POLYTRICHOIDEAE 
Represented by one species. 
XI. MONTANAE 
None of the culms short and hidden among the base of 
the leaves. 
to 
al 
w 
© 
. C. incomperta. 
. C. atlantica. 
. C. Ruthii. 
. C. angustior. 
. C. scoparia. 
. C. tribuloides. 
. C. Longii. 
. C. straminea. 
. C. alata. 
. C. normalis. 
. C. festucacea. 
C. brevior. 
. C. reniformis. 
. C. Willdenovit. 
. C. Jamesü. 
. C. leptalea. 
