88 - Cyperaceae 
CC. Spikes in an elongated spike-like cluster. 
F.  Perigynia lanceolate. 
G. Plant 1—2 dm. high; perigynia equaling the scales. E. 
C. tenuirostris 012. 
GG. Plant 2-8 dm. high; perigynia either longer or shorter than the 
scales. 
H.  Perigynia shorter than the scales, pale-brown. Wa Cok: 
C, feta Bail. 
HH. Perigynia exceeding the scales. 
I. Perigynia dull-brown; heads 1—2 cm. long. E. 
C. bebbii Oln. 
Il. Perigynia greenish; heads 2.5—4 cm. long. Wz CFE See 
festiva gracilis.) - 
C. multinoda Bail. 
FF.  Perigynia ovate. 
J. Heads 5—12 mm. long; perigymia narrowly winged. W. C. E. 
C. ilfota Bail. 
JJ. Heads 12—30 mm. long; perigynia broadly winged. 
K. Leaves 2-4 mm. wide; perigynium-beak 2-toothed; perigynia ser- 
rulate on the wings. C. 
C. straminiformis Bail. 
KK. Leaves 4-6 mm. wide; perigynium-beak entire, oblique; peri- 
gynia serrulate on the beak only. W. C. E. (C. festiva horneri; C. 
festiva stricta; C. festiva pachystachya.) 
C. festiva Dew. 
GROUP 15 
A.  Perigynia not wing-margined. 
B. Pistillate scales obtuse. W.C. E. (C. festiva horneri; C. festiva stricta; C. 
festiva pachystachya.) C, festive, Dew. 
BB.  Pistillate scales acute. 
C. Plant markedly stoloniferous; stems more or less in rows from elongated root- 
stocks. C, C. siccate, Dew. 
CC. Plant not markedly stoloniferous; stems solitary or in tufts. 
D. Perigynia 8—I2 mm. long. E. © 
C. liddoni Boott 
DD. Perigynia 4—5 mm. long. 
E. Spikes silvery-brown; top of the stem inclined to nod. W. CESS 
furva.) C. pratensis Drei. 
EE. Spikes dark-brown; top of the stem stiff, erect. 
F. Leaves bunched near the base, somewhat involute. W. C. E. 
C. phaeocephale, Pip. 
FF. Leaves not bunched, flat. W.E. (C. petasata.) 
C. leporina L-. 
AA.  Perigynia wing-margined. 
G. Perigynia more than 4 mm. long. 
H. Scales acute or acuminate, sometimes cuspidate, not hispid. 
I. Spikes quite distant; stem slender; leaves about equaling the stem. W. C. 
: C. laeviculmis Mein. 
II. Spikes rather near; stem rather stout; leaves shorter than the stem. E. 
C. deweyana Schw. 
HH. Scales hispid-awned. W. C. E. ( C. deweyana bolanderi.) 
C. bolanderi O12. 
