CTPERACE^. (SEDGE FAMILY.) 509 



Q 8. Perigynia slightly inflated, smooth and shining, green, few-nerved or nerveless, with a 



straight tapering beak terminating in 2 small inembranaceous teeth Stammate spike 



solitary : fertile spikes all on slender and pendulous stalks. No. 94 - 97. 

 9. I'erigynia slightly inflated, smooth, nerved, with a tapering somewhat serrulate beak, 



terminating in 2 distinct mernbranacecus teeth ; becoming tawny or yellow at maturity. 



Staininate spike solitary. No. 98 - 101. 

 10. Perigynia slightly inflated, rough or woolly, with an abrupt straight beak. Staminate 



spikes usually 2 or more No. 102 - 105. 

 11 Perigynia moderately Inflated, smooth (except No. 109), conspicuously many-nerved, with 



a straight beak terminating in 2 rigid more or less spreading teeth. Staminate spikes 1- 



5 No. 106 - 112 



12. Perigynia much inflated, smooth, conspicuously many-nerved, with a long tapering 2- 

 toothed beak Staminate spike solitary. No. 113 - 120. 



13. Perigynia much inflated, obovoid or obconic, smooth, few-nerved, with an extremely ab- 

 rupt, very long, 2-toothed beak, tawny or straw-colored at maturity, horizontally spread- 

 ing or deflexed. Terminal spike staininate, or androgynous and fertile at the apex. 

 No. 121, 122. 



14. Perigynia much inflated, smooth, nerved (except No 132), shining and straw-colored at 

 maturity, with a tapering and more or less elongated 2-toothed beak. Staminate spikes 

 2-3. No. 123-132 



A. Spike solitary, simple, dioecious or androgynous : bracts small, colored and scale- 

 like. PSYLLOPHOR^K, LoiSCl. 



$ 1. Spike dioecious, or the fertile merely with a few staminate flowers at the base. 

 # Stigmas 2 : leaves all radical, bristle- form. 



1. C. gy liberates, Wormskiold. Culm and leaves smooth, or minutely 

 rough at the top ; barren spike linear ; fertile spike ovoid, loosely flowered ; peri- 

 gynia oblong, short-beaked, with a white membranaceous obtusely 2-toothed apex, nar- 

 rowed at the base, nerved throughout, smooth, spreading horizontally at maturity, 

 longer than the acute or acutish scale. (C. dioica, ed. 1, not of L.) Swamps, 

 Wayne County, New York (Sartwell), to Michigan and northward. (Eu.) 



2. C. exiliS, Dew. Culm rough ; spike rarely all staminate and filiform, 

 but commonly fertile with a few staminate flowers at the base, densely flowered, 

 occasionally with 1-2 very small additional fertile spikes below the sterile 

 flowers ; pcrigynia ovate-lanceolate, plano-convex, with a few flue nerves only on the 

 convex side, serrulate on the margin, 2-toothed at the apex, spreading, rather longer 

 than the acute scales. Swamps, E. New England to New Jersey, near the 

 coast : also borders of mountain lakes, Essex County, New York. 



# * Stigmas 3 : leaves flat. 



3. O SCirpoidea> Michx. Spike narrowly cylindrical ; perhjynia ovoid t 

 with a minute point, densely hairy, dark purple at maturity, about the length of 

 the pointed ciliate scale. (C. Wormskioldiana, Hornem. C. Michauxii, Schw.) 

 Alpine summits of the mountains of Maine and N.Hampshire (Oakes, <j~c.), Wil- 

 loujjhby Mt., Vermont ( Wood), Drummond's Island, Michigan, and northward. 



2. Spike androf/i/noiis, staminate at the summit. 

 * Stigmas 2 : leaves bristle-form. 



4. C. Cclpitfatn, L. Spike small, roundish-ovoid ; perigynia broadly ellip- 

 tical with a notched membranaceous point, compressed, smooth, spreading, longer 



43* 



