190 FLORA. 



B. Perigynia short-beaked or beakless, little or not at all inflated, 1-5 mm. long, the 

 beak commonly not more than one-half as long as the body (long-beaked in Nos. 43, 82, 

 83, 96); spikes small and oblong or globose: or elongated, linear or narrowly cylindric. 

 Nos. 36-142. 



Spikes 2 or more, the staminate one always uppermost, sometimes partly pistillate. (No. 



140 may be looked for here.) Nos. 36-132. 



Pistillate spike or spikes many-flowered, mostly 2.5 cm. long or more (or shorter in 

 Nos. 44, 48, 53-55, 61, 63-65, 73, 75, 76, 85, 89-92), linear, narrowly cylindric 

 or oblong. Nos. 36-92. 



Perigynia with a straight short beak (long-beaked in No. 43 ; nearly beakless in 

 No. 36), firm or leathery in texture; pistillate spikes erect (or nodding in No. 

 37) ; stigmas 3. Nos. 36-43. [p. 197.] 



Perigynia beakless or very short-beaked (see No. 36), and with orifices nearly or 



quite entire, thin in texture, not inflated, closely investing the achene ; 



pistillate spikes erect or drooping, often brown or purple; stigmas often 2. 



Nos. 44-72. 



Pistillate spikes erect or somewhat spreading (drooping when mature in No. 



45). Nos. 44-58. [p. 199.] 

 Pistillate spikes drooping, mostly on slender or filiform stalks (erect in Nos. 



66 and 71). Nos. 59-72. [p. 201.] 



Perigynia tapering to a distinct beak (nearly or quite beakless in Nos. 73-77), 

 membranous in texture (firm in No. 88), inflated or loosely investing the 

 achene; pistillate spikes mostly drooping, often narrowly linear. Nos. 



73~9 2 - 



Terminal spike staminate below, pistillate above; beak of the perigynium 

 short or none. Nos. 73-81. 



Spikes all erect or nearly so. Nos. 73-76. VIRESCENTES. [p. 204.] 

 Pistillate spikes drooping or spreading (erect or little spreading- in 



No. 78). Nos. 77-81. GRACILLIMAE. [p. 205.] 

 Terminal spike entirely staminate, or sometimes pistillate at the base. Nos. 



82-92. [p. 206.] (See No. 140.) 



Pistillate spikes small, few-many-flowered, mostly 6-25 mm. long (sometimes longer 

 in Nos. 103, 104, 116). Nos. 93-132. (See also Nos. 44, 48, 53-55, 61, 63-65, 

 68, 73, 75, 80, 84, 85 and 89-92.) 

 Perigynia glabrous. Nos. 93-120. [p. 208.] (See No. 123.) 



Pistillate spikes many-flowered, 6-25 mm. long, usually dense. Nos. 93-99. 

 Pistillate spikes few-several-flowered, often loose. Nos. 100-120; 136-138. 

 Perigynia more or less pubescent (becoming glabrous in No. 123). Nos. 121- 



132. [p. 213.] 

 Spike solitary (except in No. 140), sometimes dioecious. Nos. 133-142. [p. 215.] 



II. Staminate flowers few, at the summits or bases of the always sessile spiLes, or 

 sometimes forming whole spikes, or variously intermixed with the pistillate: stigmas 

 always 2; achene lenticular, compressed, ellipsoid or plano-convex. Nos. 143-205. 



VIGNEA! 



Staminate flowers at the summits of the spikes. Nos. 143-173. 



Spike solitary, terminal, mostly brown, plants often dioecious. Nos. 143-146. 



DlOICAE. [p. 217.] 



Spikes several or many, clustered, separated or sometimes panicled. Nos. 147-151. 

 Spikes densely aggregated into a globose or ovoid head, often appearing like a 



solitary terminal spike. Nos. 147-151 [p. 218.] 

 Clusters of spikes looser, often compound or the spikes distinctly separated (more 



or less aggregated in Nos. 170-173). Nos. 152-173. 



Spikes yellowish or brown at maturity, often in compound or panicled clus- 

 ters. Nos. 152-163. [p. 218.] 

 Spikes green or greenish when mature, aggregated or separated, in simple 



clusters. Nos. 164-173. MUHLENBERGIANAE. [p. 220.] 

 Staminate flowers variously mingled with the pistillate in the spikes or occasionally 



forming whole spikes. (See Nos. 143-146.) 



Perigynia radiately spreading or reflexed. 174. C. sterilis. 



Perigynia erect or appressed. 



Perigynia wingless, the inner face flat. 187. C. bromoides. 



Perigynia winged, the inner face concave. 190. C. siccata. 



Staminate flowers at the bases of the spikes. Nos. 174-205, 



Perigynia without a marginal wing. Nos. 174-187. ELONGATAE. [p. 222.] 

 Perigynia with a narrow or broad marginal wing. Nos. 188-205. OVALES. [p. 225.] 



I. Carex pauciflora Lightf. FEW-FLOWERED SEDGE. (I. F. f. 671.) Glabrous; 

 culms slender, 0.7-5 dm. high. Leaves very narrow, shorter than the culm, spike 



