288 CYPERACEAE. 
tt seiuee pire drooping or spreading (erect or little spreading in no. 78). 
Perigynia 1''-2"' long, slightly swollen; spikes linear or linear-cylindric. 
Plant piabrand: perigynia obtuse. 77. C. gracillima. 
Sheaths pubescent; perigynia pointed at both ends. 
Perigynia x long; spikes erect or somewhat spreading. 78. C. aestivalis. 
Perigynia 2'' long; spikes drooping, at least when old. 79. C. oxylepis. 
Perigynia 2'’-2'4"' long, manifestly swollen; spikes oblong or oblong- get 
Perigynia faintly few-nerved; scales ovate, acute or short-awned. 80. C. formosa. 
Perigynia strongly many-nerved; scales lanceolate, long-awned. 81. C. Davisit. 
+t Terminal spike entirely staminate, or sometimes pistillate at the base. 
GRACILLIMAE. 
Nos. 82-92. (See no. 140.) 
Perigynia manifestly beaked, nerved or nerveless; pistillate spikes drooping, at least when old. 
Beak of the perigynium cylindric or subulate, 1-2 times as long as the body. SYLVATICAR. 
Perigynia broadly oval, smooth, spreading. 82. C. longtrostrts. 
Perigynia narrowly conic, tuberculate- hispid, appressed. 83. C. Assintbotnensis. 
Beak of the perigynium not more than one-half as long as the body. 
Leaves pubescent, FLEXILES. 
Leaves glabrous. 
Pistillate spikes narrowly oblong, 2'’-6'’ long; perigynium 1’ long; arctic and alpine 
Species. CAPILLARES. 85. C. capillarts. 
Pistillate spikes linear, 1'—3' long; perigynium 2''-3'' long. DEBILES. 
Perigynia membranous, few-nerved; pistillate spikes slender. 
Leaves 2%4''-5'' wide; scales two-thirds as long as the perigynia. 
86. C. arclata. 
Leaves 1''-2%4'' wide; scales one-half as long as the perigynia. 
87. C. lenuts. 
Perigynia coriaceous, strongly many-nerved; pistillate spikes thicker. 
88. C. oblita. 
Perigynia beakless or minutely beaked, finely many-striate; spikes erect or nearly so. GRISEAR. 
Leaves slightly or not at all glaucous. 
Perigynia little longer or shorter than the scales. 
Pistillate spikes dense, usually many-flow ered; leaves 2'’-3'’ wide, spreading, soft. 
. C. grisea. 
Pistillate spikes loosely several-flowered; leaves 1''-2'' wide, mostly erect and rigid. 
go. C. amphibola. 
gt. C. flaccosperma., 
92. 4 glaucodea. 
84. C. castanea. 
Perigynia 2-3 times longer than the scales. 
Plant very glaucous all over. 
2. Pistillate spikes small, few-many-flowered, mostly 3''-12'' long (sometimes longer in nos. 103 
104, 116). Nos. 93-132. (See also nos. 44, 48, 53-55 ss 63-65, 68, 73, 75, 80, 84, 85 and 89-92. ) 
* Perigynia glabrous, Nos. 93-120. (See no. 123.) 
+ Pistillate spikes many-flowered, 4’-1' long, usually dense. Nos. 93-99. 
Pistillate spikes scattered, distant, long-stalked or the 2 upper ones close together and nearly ses- 
sile. GRANULARES. f ; 
Bracts elongated, mostly overtopping the spikes; perigynia strongly many-nerved. 
93. C. granularts. 
Bracts short, rarely overtopping the spikes; perigynia obscurely few-nerved. 94. C. Crawet. 
Pistillate spikes close together and nearly sessile at the summit of the culm, or the lowest distant 
and stalked. 
Beak of the perigynium stout, 2-toothed; plants glabrous. EXTENSAF. 
Leaves strongly involute; perigynia brown, the beak shorter than the body. 
95. C. exlensa. 
Leaves flat, 1''-2'4'’ wide; perigynia yellow when mature, 2'’-3'’ long, the beak about as 
long as the body. C. flava. 
Leaves flat, 1’ wide or less; perigynia dark green, 1'’ long, the beak one- half as long as the 
body. rs 
g7. C. wiridula. 
Beak of the perigynium short, entire or none; leaves, or their sheaths, more or less pubescent- 
PALLESCENTES. 
Perigynia faintly few-nerved, beakless. 
98. C. pallescens, 
Perigynia strongly many-nerved, cylindric-beaked. 
99. C. abbreviata. 
++ Pistillate spikes few-several-flowered, often loose. Nos. 100-120; 136-138. 
= Scales of the spike normal, not elongated and leaf-like. Nos. 100-120. 
2 Leaves 1''-18'' wide; bracts leafy, usually large. Nos. 100-119. 
O Perigynia green (yellow or purple in no. 116). Nos. 100-117. 
Perigynia finely many-striate. OLIGOCARPAE. 
Sheaths glabrous. 
Perigynia narrowed at both ends, beakless. 
Perigynia with a short entire beak. 
Sheaths pubescent. 
Perigynia with few or many, mostly strong nerves. I,AXIFLORAR. 
Plants not at all glaucous, or very slightly so. 
Beak of the perigynium straight, slender. 
Culms slender, spreading; pistillate spikes 2 or 3, stalked, spreading. 
103. C. altocaulis. 
Culms stout, erect; pistillate spikes I or 2, erect. 104. C. polymorpha. 
Beak of the perigynium bent, short or none. 
Leaves mostly narrow, 1''-6'’ wide. 
Scales, at least the upper, obtuse. 
Bracts elongated; spikes loosely flowered; culms slender. 105. C. fetanica. 
Bracts short; spikes densely flowered; culms stout. 106. C. Meadii. 
100. C. conoidea. 
101. C. Oligocarpa. 
102. C. Hitchcockiana. 
