CYPERACEAE 
Perigynium strongly many-nerved dorsally: body 
of — little shorter than to exceeding peri- 
gyn sheaths thickened at mouth. 
Perigynium strongly nerved ventr ally, narrowly 
wing-margined to base, the margin and center 
se ra elevated: head oblong: achene sub- 
orbic 
Perigynium nerveless or nearly so ventrally, 
p-edged below the middle, flat or very 
ne ae SO. 
Head oblong, 1.5-4 cm. long: culms tall, 
AO leaf blades elongate: achene ovoid- 
or 
Head sere sequ 0.7-2 cm. long: culms 
low, not stiff, spreading : leaf-blades short. 
II. MULTIFLORAE 
Beak of perigynium equalling the body: leaves usually 
exceeding culm : perigynium dull-yellowish. 
e 
` 
bi 
t 
Body of perigynium reniform or broadly orbicular, 
strongly resinous-dotted: perigynium squarrose, 
mostly exceeding awn of scale. 
Body of perigynium ovate to broadly e but 
little resinous-dotted : D Hor cend- 
ing, mostly exceeded by awn of scale. 
II oe 
Represented by one species in our ran 
IV. STENORHYNCHAE 
Perigynium 4-6 mm. long; beak 1-2 times length 
of body: leaf-sheaths not red-dotted ventrally. 
Sheaths cross-rugulose ventrally, easily broken, no 
thickened at mouth. 
Leaf-blades 4-8 mm. wide; perigynium 4-5 m 
long, the beak about the length of the Bode 
Leaf-biades 8-15 mm. wide: perigynium 5-6 
long, the beak longer than the body. 
Sheaths n not cross- ue ddr SRI) not easily 
Perigynium 6—7 mm. lon da disk-like base 
2-8 times length of body: a TE 
red-dotted ventrally. 
CANESCENTES 
Represented by one species in our range. 
VI. DEWEYANAE 
Represented by one species in our range 
VII. STELLULATAE 
Body of perigynium broadest near middle; beak not 
serrulate on margins. 
Body of edt haere broadest near base; beak ~ often 
upper part of body e on margin 
Perigynium 2.25-3. 25 long: pe ccn mene 
14—14 length of bo d very shallowly biden- 
e: pas — to two-thirds length of 
bo erigyn 
n strongly ritos leaf-blades 0.25-1 mm. 
Ee. aggregated in a dense head: leaf-blades 
1-2.5 m 
Perigynium 2.15-4. 75 mm. long: perigynium-beak 
sharply bidentate, the ventral false suture 
conspicuous. 
Body of an risus suborbicular or very broadly 
ova ares See at maturity (before age 
DEA k less than half the length o 
E 
et 
I 
D 
Q 
23. 
