CYPEKACE^. (SEDGE FAMILY.) 509 



t> 8. Perigyma slightly inflated, smooth and shining, green, few-nerved or nerveless, with a 

 straight tapering beak terminating in 2 small membranaceous teeth Staminate spike 

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

 9. Perigynia slightly inflated, smooth, nerved, with a tapering somewhat serrulate beak, 

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

 Staminate spike solitary. No. 98-101. 



10. Perigyuia 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 staminate, or androgynous and fertile at the apex. 

 No. 121, 122. 



14. Perigyuia 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. S]>ike solitary, simple, dicecious or androgynous : bracts small, colored and scale- 

 like. — Psyllopiior.e, Loiscl. 



(> 1. Sj)ike dicecious, or the fertile merely with a few staminate flowers at the base. 

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



1. C gynocrates, Wormskiold. Culm and Luces 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 (Smiwell), 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 ; perigynia ovate-lanceolate, plano-convex, with a few Jine nerves only on the 

 convex sid', 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. C. §cil'f$Osdea, Michx. Spike narrowly cylindrical ; perigynia ovoid, 

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

 the pointed ciliate scale. (C. Wormskioldiana, llornem. C. Michauxii, Sclav.) 

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

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



§ 2. Spike androgynous, staminate at the summit. 

 * Stigmas 2 : leaves bristle-form. 



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

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



43* 



