454 T. Holm — Studies in the Cyperacem. 



Astrostacliym nob. 

 Spikes several, short and few-flowered, sessile, remote, gynae- 

 candroiis or the lower ones purely pistillate ; bracts short and 

 narrow ; scales brownish ; perigynia spreading, brownish, ses- 

 sile, cordate or ovate, plano-convex, nervose, spongious at the 

 base, winged, tapering into a serrulate, bidentate beak ; stig- 

 mata two. 



JSebetatce: C. dioica L., parcdela Laest., gynocrates Wormskj., 



Davalllana Sm., exilis Dew. 

 Centrales : C. stellulata Good., scirpoides Schk., sterilis Willd., 



interior Bail., albata Boott, nuhigena Don, elongata L., 



IcBviculmis Meinsh. 

 Desciscens : C reniota L. 



AcanthophorcG nob. 

 Spikes several, mostly short, but often dense-flowered, ses- 

 sile, contiguous or remote, androgynous ; bracts often long, 

 but narrow ; scales brownish ; perigynia somewhat spreading, 

 brownish, mostly sessile, ovate and acuminate to suborbicular 

 and abruptly beaked, plano-convex, faintly nerved or nerveless, 

 spongious at the base, narrowly winged, the beak serrulate, 

 bidentate ; stigmata two. 



Centrales: C. rosea Schk., dlvulsa Good., sparganioides Muehl., 

 Muehlenherg li Schk., glomerata Thunbg., cephaloidea Dew., 

 muricata L., lejorhyncha, Mey., Hooherlana Dew., occiden- 

 talls Bail., vagans sp. n., trachycarpa Cheesera,, Hoodii 

 Boott, gravida Bail., alopecoidea Tiickm., conjuncta Boott., 

 vidpina L., phaeolepis sp. n., clirysolenca sp. n,, vitrea sp. n. 



Desciscentes : C. cephalophora Muehl. , vulpinoidea Michx., vica- 

 ria Bail., Maackii Maxim., gibba Wahl. 



Stenorhynchm nob. 

 Spikes several in a dense-flowered, decompound panicle or 

 head, sessile, contiguous, androgynous ; bracts conspicuous, but 

 usually narrow ; scales green or light brown ; perigynia spread- 

 ing, light brown or greenish, stipitate, ovate, tapering into a 

 very long, bidentate beak, plano-convex, nervose, the narrow 

 margins seiTulate ; stigmata two. 



Centrales: C crus corvi Shuttlew., stipata Maehl. 



Sychnocephalce nob. 

 Spikes numerous in a dense-flowered head, sessile, gynsecan- 

 drous; bracts very long, leaf -like; scales green or light brown ; 

 perigynia erect, linear-lanceolate, acuminate, light green, stipi- 

 tate, compressed, few-nerved, wingless, the beak very long, 

 serrulate, bidentate ; stigmata two. 



Centrales : C. cyperoides X., sychnocephala Carey. 



