464 T. Holm — Studies in the Gyperacece. 



Physocarpce Drej. • • 



Spikes several, cylindrical, sessile or the lowermost pedun- 

 cled, erect, remote, the terminal and, sometimes, the upper- 

 most lateral staminate, the others pistillate ; bracts foliaceous, 

 but mostly narrow, sheathless ; scales lanceolate, acuminate, 

 brownish or purple ; perigynia shining, light green to dark 

 purplish, almost black, spreading, but not refiexed, membrana- 

 ceous, globular to oblong-elliptical, membranaceous, inflated, 

 sessile, nervose, glabrous, the beak short, bidentate to merely 

 emarginate ; stigmata three, seldom two. 



HehetaUa: C. Engelmannii Bail. 



Centrales : C. aynhusta Boott, oligosperma Michx., miliaris 

 Michx., ampullacea Good., IcBvirostris Fr., rotundata Wahl., 

 ntricidata Boott, physocarpa Presl., physochloena sp. n., vesi- 

 caria L., pidla Good., Olneyi Boott, mirata Dew.,* compacta 

 R. Br. 



Physocephaloe Bail, ex p. 

 Spike single, oval to globose, androgynous ; scales lanceolate, 

 reddish brown with broad hyaline margins ; perigynia reddish 

 brown, spreading, membranaceous, much inflated, sessile, faintly 

 nerved, glabrous, the beak short with hyaline, obliquely cut 

 oriflce ; stigmata three. 



Hehetata : C. JBreioerl Boott. 



Rhynchophorm nob. 

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

 sessile or short peduncled, mostly erect, contiguous, the ter- 

 minal staminate, the others pistillate or, sometimes, the upper- 

 most lateral staminate ; bracts foliaceous and very long, the 

 lowermost with a short sheath ; scales pale, lanceolate, aristate 

 or mucronate; perigynia greenish, erect or ascending, mem- 

 branaceous, ovate, mnch inflated, stipitate, strongly nerved, 

 glabrous or scabrons along the very prominent beak, which is 

 sharply bidentate ; stigmata three. 



Hehetatce: C.uda Maxim., Michauxiana ^o^w^ folliculata\i. 



Centrales : C. intumescens Rudge, Grayii Carey, Idzuroei Fr. et 

 Sav., nionile Tuckm., Halei Carey, hidlata Schk., Tucker- 

 mannii Boott, hipnlina Muehl., gigantea Rudge, hirida 

 Wahl., Dickinsii Fr. et Sav. 



Desciscens : C. rhynchophysa Mey. 



Brookland, D. C, Aug., 1903. 



* = exsiccata Bailey. 



