144 CYPERACEAE 
Spikelet-scales less than 3 mm. long. 
Spikelet-scales 3 mm. long or more. 
, - XIII. ARTICULATI 
Tall gregarious perennial, the leaves mostly represented 
by basal sheaths: spikes umbel-like. 
XIV. ERYTHRORHIZI 
Spikelets m D ore mostly over 5 mm. long: spikes 
mainly ellipso 
Spikelets few-flowered, mostly less than 5 mm. long: spikes 
mainly cylindri 
XV. oe 
Spike-rachis very short, the spike thus globos 
Spike-rachis Eu fhe Es thus longer than wide. 
chene over % a s the subtending scale. 
Achene less iun S do A fone as the subtending scale. 
Scales uh s ue appressed : anthers less than 
Seales "of Pu *pikelets lax: anthers over 0.5 mm. 
long. 
XVI. PRAELONGATI 
Spikelets loosely spicate or paniculate, or capitate. 
Spikelets in d or many spikes or panicles. 
chene . long, less Erie E as long as the 
scale: Suhiewinds very narr 
ia ne 2.5-3 mm. long, fully 15 2s EHE as the scale: 
achis-wings bro 
Spik elets capitate, the hoad solitary. 
Spikelets crowded, sometimes densely so, in globose, cylin- 
dric, or obovoid spikes 
Spikelets e or deflexed, Mae spikes broadest at the 
ove the mi 
Scape SOnEH- pubescent, AE least above. 
In noe eee h: lower spikelets de- 
exe 
Inflorescence- du. smooth: lower spikelets re- 
flexed-spreadin 
Scape smooth and gla labro 
as T AET in all prm only the basal 
exe 
Spikes oar fh Ras Ten to cylindric, or narrowed 
Spikes ERE to cylindri 
.5 mm. long p? less. 
Sp fiel E P id -flowered : rachis-wings 
oa 
Spikes ellipsoid, sometimes nar- 
ii ue por E spikelets 3-4 
long, gre 
Spikes cylindric, “the larger ones, 
lea eo compound: spikelets 
long, stramineous. 
Spikelets 3-44 flowered: rachis- -wings 
very na 
Spikelets 5 i lon ng or mo 
xdi stramineous : saks 1.5-2 mm. 
ng, 
Spikes green : scales 2.5-3 mm. long, 
closely appressed. 
Spikes globose. 
XVII. TETRAGON 
alas S bearing 1-4 achenes; i ies ap- 
Spikes dense, the spikelets usually crowded Ra aes 
Spikes umbellate, ov ee e e globose, or de- 
spikelets subul 
Spikes o a so ometimes “with a small clus- 
Spikes ellipsoid p? oval. 
30. 
38. 
39. 
QR 
. C. 
. C. 
E C. 
. C. 
«€. 
. C. 
esculentus. 
lutescens. 
. articulatus. 
. erythrorhizos. 
Halei. 
Martindalei. 
litoreus. 
strigosus. 
stenolepis. 
praelongatus. 
refractus. 
floridanus 
retrofractus. 
dipsaciformis. 
hystricinus. 
lancastriensis. 
retrorsus. 
Torreyi. 
. C. Deeringianus. 
C. 
Pollard. 
Winkleri. 
Plankii. 
ovularis. 
51. C. Nash. 
