CyPERACE^. (SED&E iPAMILT.) 509 



4 8. Perigynla sU^tly inflated, emootb and .Bhinl^g, green, few-nerved or nerveless, with a 



straiglit tapering beak terminating in 2 small membranaceons teetli. Staminate spike 



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

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



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



Staminate-epike 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. 

 U. Perigynia moderately inflated, smooth (except No. 109), conspicuously many-nerved, with 



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



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

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

 8-?, No. 123 -132. 



A« Spike solitary, simple, dioecunfs or andnDgynous ; bracts small, colored and scale- 

 like. — Psyll6phok.s!, Loisel. 



§ 1 . Spike dioecious, or the fertUe merely with a few staminate flowers at the base. 

 * Stigmas 2 : leaves all radical, bris^-form. 



1. C. gyn6cra.tes, Wormskiold. Cidm and leaves smooth, or minutdy 

 rough at the top ; barren spike linear ; fertiie spike ovoid, loosdy flowered ; peri- 

 gynia (Along, short-beaked, with a white membranaceous obtusely ^-toothed apex, nar- 

 rowed at the base, nerved throughovt, smooth, spreading horizontally at natwity, 

 longer than the acute or aeutish scale. (G. dioica, ed. 1, not of £,) — Swanks, 

 Wayne County, New Tork (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, densek/ Jlowered, 

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

 flowers ; perigynia ovate-lanceolate, plano-coraiex, with a Jke fine 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 fiat, 



3. C. SCirpoIdea, Michx. Spike narrowly cylindrical ; perigynia ovoid, 

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

 the pointed ciliate scale. (C. Wormskioldiana, fibrnem. C. Michauxii, ScAw.) 

 — Alpine summits of the White Mountains, New Hampshire (Oakes, S/'c), Wil- 

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



J 2. Spike androgynous, staminate at the summit. 

 * Stigmas 2 : leaves bristUfiyrm. 



4. C. capit&ta, Xj. Spike small, roundisb-oroid; perigynia broadly ellyo- 

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



43* 



