462 T. Holm — Studies in the Cyperacece. 



DescisceJites : C. tomentosa 1j., glohularis l^.^Chapmanii Sartw., 

 dasycarpa Muehl., W/iitneyi Olney, puhescens Michx., 

 Coidteri Boott, pisiformis Boott. 



Trichocarpce nob. 

 Spikes several, cylindrical and more or less robust, dense- 

 flowered, sessile or the lowest ones peduncled, but erect, remote, 

 the terminal and uppermost lateral staminate, the others pistil- 

 late ; bracts foliaceous, often very long, sheathing ; scales 

 purplish or brown, mucronate to aristate ; perigynia brownish 

 or dark green, erect, ovate to ovate-lanceolate or elliptical, more 

 or less turgid, sessile, nervose, more or less pubescent, prom- 

 inently beaked, the beak bidentate with spreading teeth ; stig- 

 mata three. 



Centrales: C. vestlta^'iW^., Yosemitana Bail., hirtissima W. 

 Boott, Oregonensis Olney, liirta L., filiformis L., lanugi- 

 nosa Michx., evohUa Hartm., Houghtonii Torr., trichocarpa 

 Muehl., aristata R. Br., striata W\c\\x., Pierotii ^W(\., pumila 

 Tbunbg., Wahuensis Mey., psilocarpa Steud. 



Desciscentes : C. nutans Host, paludosa Good., riparia Curt., 

 suhdola Boott, trifida Cavan., Songorica Karel. et Kir., 

 haccans Nees, Myosiirus Nees, composita Boott, hrunnea 

 Thunbg. 



Echinochloence nob. 

 Spikes several, cylindrical, dense-flowered, sessile and erect, 

 remote, the terminal staminate or sometimes andro- to gynae- 

 candrous, the lateral pistillate, often with a few staminate 

 flowers at the base or apex ; bracts foliaceous and often very 

 long, sheathing ; scales light purplish to brown, mucronate to 

 aristate ; perigynia shining reddish brown, seldom grayish, 

 erect, elliptical to oval, plano-convex or ti'igonous, sessile, 

 nerved, the beak short, bidentate and prominentl}^ spinulose ; 

 stigmata two or three. 



Centrales: C. lucida Boott, Lamhertiana Boott, Buchanani 

 Berijrgr., Wakatipu Petrie, dipsacea Berggr., dissita Sol., 

 uncifolia Cheesem., Petriei Cheesem., testacea Sol., iVee- 

 siana Endl. 



Desciscentes : C. decurtata Cheesem., Raoulii Boott., comans 

 Berggr., cirrhosa Berggr. 



Hymenochlcenm Drej. 

 Spikes several, cylindrical, slender and not very dense-flow- 

 ered, peduncled and drooping, remote, the terminal staminate, 

 the lateral pistillate ; bracts foliaceous, the lowest sheathing ; 

 scales hyaline with green, excurrent midrib ; perigynia light 

 green, erect to slightly spreading, membranaceous, oval to ellip- 



