456 T. Holm — Studies in the Cyperacece. 



Fterocarpce nob. 

 Spikes several, large, heavy and dense-flowered, contiguous 

 or the lower ones remote, sessile, gynsecandrous ; bracts incon- 

 spicuous ; scales light brown or green ; perigynia erect or 

 slightly spreading, ovate to orbicular, light brown or greenish, 

 compressed, nervose, broadly winged with a j)rominent, serru- 

 late, bidentate beak ; stigmata two. 



Centrales: C. cristata Schw., albolutescens Schw., mirahilis Dew., 

 alata Torr., straminea WiUd., straminiformis Bail., tenera 

 Dew., BickneUii Britt., sillcea Olney, festucacea Schk. 



Desciscentes : G. Bebbii OXn^y^foenea ^Q\sk.^ planata Fr. et Sav., 

 yieurocarpa Maxim. 



Microcephalce nob. 

 Spike single, shining brown, very small, roundish to oval, 

 dense-tlowered, androgynous ; scales broadly ovate, brown with 

 hyaline margins ; perigynia greenish, spreading at maturity, 

 membranaceous, broadly ovate, sessile, nerveless, glabrous, 

 tapering into a straight beak with hyaline orifice, slit on the 

 convex face; stigmata two. 



Hebetaia : C. cap)itata L. 



Cephalostachym nob. 

 Spikes several, reddish brown, androgynous, dense-flowered, 

 sessile in a roundish or oblong head ; bracts mostly inconspic- 

 uous, scales ovate to lanceolate, acute ; perigynia shining 

 brown, plano-convex, elliptical to ovate, sometimes turgid, stipi- 

 tate to sessile, prominently many-nerved, scabrous along the 

 beak, the orifice of which is bidentate or merely slit on the 

 convex face ; stigmata two. 



Centrales: C. foetida All., Colensol Boott, stenophylla Wahl., 

 chordorrhiza Ehrh. 



SpJiCBrostachycB nob. 

 Spikes several, androgynous, dense-flowered, sessile in a 

 roundish head ; bracts inconspicuous ; scales broadly ovate, 

 acute, shining brown with hyaline margins ; perigynia yellow- 

 ish, becoming fuscous at maturity, membranaceous, ovate, tur- 

 gid, distinctly stipitate and diverging, nerveless or nearly so, 

 glabrous or minutely scabrous along the prominent beak with 

 obliquely cut orifice ; stigmata two. 



Centrales : C. incwva Lightf., duriuscula Mej. 



II. Caeices genuine. 



Melananthce Drej. 

 Spikes several, dense-flowered, peduncled, • but mostly con- 

 tiguous, gynaecandrous, or the terminal staminate and the 



