T. Holm — Studies in the CyperacecB. 463 



tical, turgid and trigonous, stipitate, faintly nerved or nerve- 

 less,, scabrous along the prominent, bifid or bidentate beak 

 with hyaline orifice ; stigmata three. 



Hehetatoe : C. rhizopoda Maxim., Steudelli Kth., ■ Willdenowii 

 Schk., Backii Boott, macroglossa Fr. et '^2i\.^ filijyes Fr. et 

 Sav. parciflora Boott, longerostruta Mey. 



Centrales: C. arctata Boott, vacillans Sol., dehilis Michx., sil- 

 vatica Hnds., elata Lowe, Cherokeeiisis Schvv., Arjiellii Christ, 

 transversa Boott, curvicolUs Fr. et Sav., anisostachys Liebm., 

 longirostris Torr., Turczaninovian a Meinsh., flexilis Rudge, 

 capillaris L., Krausei Bckh-., WHUamsii Britt. 



Desciscentes : C. Assiniboinensis W. Boott, prasina Wahl,, 

 Chinensis Retz., scahrata Schw., confertiflora Boott, dispa- 

 latha Boott, ollvacea Boott, amplifoUa Boott, sp)eciosa Kth., 

 Janiesonii Boott. 



Spirostachyce Dre j . 

 Spikes several, cylindrical, but rather short, dense-flowered, 

 peduncled, but mostly erect, remote, the terminal staminate, 

 the lateral pistillate; bracts foliaceous, sheathing; scales brown- 

 ish, acuminate ; perigynia mostly greenish, more or less spread- 

 ing at maturity, oval to elliptical, somewhat turgid, sessile, 

 nervose, glabrous or scabrous along the beak, which is quite 

 long and bifid ; stigmata three. 



Centrales: C. Hornsehucliiana Hppe., diluia M. Bieb., punc- 

 tata Gaud., distans L., hinervis Sm., loevigata Sm., Camposii 

 Boiss. et Reut., Lemmonil W. Boott, extensa Good., Mairii 

 Coss. et Germ., aphanolepis Fr. et Sav., tricho styles Fr. et 

 Sav., JRinggoldiana Boott, JMichelii Host, brevicollis D. C, 

 flana L., Oederi Retz., viridula Michx., 3Iorrowii Boott. 



Desciscentes : C. squarrosa L., typhina Michx., stenolepis Torr. 



Echino slack ycB Drej. 

 Spikes several, cylindrical, robust and dense-flowered, the 

 terminal staminate often gynsecandrous, the lateral pistillate, 

 peduncled and drooping, contiguous, squarrose at maturity ; 

 bracts foliaceous and very long, the lowest one sheathing; 

 scales lanceolate, light brown or greenish, mucronate to aris- 

 tate ; perigynia greenish, reflexed at maturity, membranaceous, 

 ovate to elliptical-ovate, somewhat inflated, trigonous, stipitate, 

 prominently nerved, glabrous, the beak distinct, bidentate; 

 stigmata three. • 



Sebetatce : C. niicroglochin ^ 2^\.^ pauclflora Lightf. 



Centrales : G. subulata Michx., Pseadocyperits L., Forsteri Wahl., 

 alopecuroides Don, Doniana Sprgl., fascicularis Sol., 

 Schweinitzii Dew., hysiricina Muehl., retrorsa Schw. 



