572 CYPEKACE^. (sedge FAMILY.) 



i 1. Spikes approximate, with staminate and iiistillate flowers variously situated. No. 10-12. 



2. Spikes pistillate below, stamiiiate at the suniinit. No. 13 -2S. 



3. Spikes pistillule above, stauiia.ite ai the base. No. 'Jd-46. 



D« Stainiuate and pistillate flowers borne in separate (commonly more or less stalked) simple 

 spikes on tlie same uuhn ; the one or more stamiuate (sterile) spikes constantly upper- 

 most, having; occasioniilly more or less fertile flowers at base or apex; the lower spikes 

 all jiistilliite (fertile), or sometimes with staminate fljwei"s at the base or apex. Siigmas 

 3 (or only 2 in No. 40, 53, 05, 150, &i;.). CAUK.K proper. 



* Pcrigynia with merely a mioute or short point, scarcely ever prolonged into a beak. 



i 1. Perijrynia not inflated (sli;:;htly so in No. 55, bo), snD.Hh, nerved or nerveless, with a 

 minute straiffht point, trlaucous-j?reen, becmiiuj,' whiiish, or more or less spotted or 

 tinged with purple. Scales blackish-purple or brown. Staminate spikes 1-3, or the ter- 

 minal spike androgynous and staminate at the b.ise, the rest all fertile. No. 46-64. 



2. Perigynia slightly inflated, smooth, nerved, obtuse and pointless, or with a straight or 

 oblique pi.int. Scales brown, becoming tawny or while. Staminate spike solitary (ex- 

 cept sometimes in No. 71) or andr.)gyuous and pistillate above, the rest all fertile. No. 

 65-81. 



3. Perigynia slightly inflated, hairy (in No. 83 smooth at maturity), nerved, with a minute 

 straiglit point. Terminal spike androgynous, pistillate at the ape.x, the rest all fertile. 

 No. 82. 83. 



4. Perigynia not inflated, smooth, regularly striate, with a short, entire, obliqualy bent or 

 recurv-ed point, remaining green at maturity. Staminate spike solitary. Bracts green 

 and leaf-like (e.xcept in No. 84). No. 84 - 91. 



6. Perigynia not inflated, smooth or downy, not striate, with a minute, obliquely bent, 

 white and membranaceous point, reddish brown or olive-colored at maturity. Terminal 

 spike all staminate or with 2-3 fertile flowi rs at the base ; the rest all fertile, or with a 

 few sterile flowers at the apex. Bracts reduced to colored deaths, or with a short green 

 prolongation. No. 92, 93. 



♦ * Perigynia with a distinct beak, either short and abrupt, or more or less prolonaed. 



6. Perigynia not inflated, hairy, with a rather abrupt beak, terminating in a membrana- 

 ceous notched or 2-toothed orifice. Bracts shi)rt : culms mostly low and slender ; leaves 

 all radical, hmg and narrow. Staminate «pike solitary. No. 94-101. 



7. Perigynia slightly inflated, hairy or smooth, with a short beak terminating in an entire 

 or slightly notched orifice. Bracts long and leaf-like : culms tall and leafy. Staminate 

 spike solitary (in No. 102 pistillate at the summit): fertile spikes erect (except in No. 

 102). No. 102, 103. 



8. Perigynia slightly inflat?d, smooth and shining, green, f"W-nerved or n^rvelpss. with a 

 straisht tapering beak terminating in 2 sm.ill membranaceous teeth. Staminate spike 

 solitary (often androgynous in No. 107) : ft-rtile spikes all on slender and pedulous 

 stalks. No. 104-110. 



9. Perigynia slightly inflnted. smioth, nerved, with a tapering somewhat serrulate beak, 

 terminating in 2 distinct mem'iranacenu^ teeth ; becoming tawny or yellow at maturity. 

 Staminate spike solitary. No. Ill- 115. 



10. Perigynia slightly inflated, rouirh or pubescent, ranly smooth, with an abrupt straight 

 bi^ak. Staminate spikes usually two or more. No. llG-119. 



11. Perigynia moderately inflated, smooth or pubescent, conspicuously many-nerved, ^with 

 a straight beak terminating in 2 rigid more or less spreading teeth. Stajninate spikes 

 1-5. No. 120-127. 



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

 toothed beak. Staminate spike solitary No. 12? -130. 



13. Pcrigynia much infliited, obovoil or obconic, smooth, few-nerved, with an extremely ab- 

 rupt, very long, 2-tonthed b?ak, tawny or straw-colored at maturity, horizontally spread- 

 ing or defl -xed. Terminal spike staminate, or androgynous and fertile at the apex. 

 No. 137-133. 



14. Perigynia much inflated, smooth, shining and straw-colored at maturity, with a taper, 

 ing and more or less elongated 2-tootheU beak. Staminate spikes 2-5. No. 139 - 151. 



