332 CYPERACE^J. (SEDGE FAMILY.) 



Var. JDeweyi, Bailey. Usually more slender than the last, the leaves 

 and sheaths smooth : pistillate spikes 1 to 2 inches long and inch or 

 less broad : perigynium very smooth, usually somewhat polished, rather 

 coriaceous, the nerves not conspicuous, the teeth mostly short : scale usually 

 not conspicuously awned. C. Iceviconica, Dew. Big Sioux and Yellow- 

 stone Rivers (Hayden), Bismarck, Dakota (A. B. Seymour). These varieties 

 pass by all gradations into the species, which may occur within our eastern 

 limits. 



11. Sterile and fertile spikes one to several or many: fertile spikes mostly large 

 and compactly flowered : perigynium much inflated (cross- sect ion nearly twice 

 or much more than twice the width of the mature achenium), membranaceous, 

 smooth, conspicuously nerved (or nearly nerveless in No. 35), tapering into a 

 toothed beak as long as the body or longer. PHYSOCARP^E, Drejer. Mostly 

 large and stout species, to be regarded as the most developed of the genus. 

 No. 35 is the least developed of the section, and in some forms it appears 

 to ally itself with other and very dissimilar sections. 



* Staminate spike solitary, stalked: pistillate spikes sessile or nearly so, short and 



thick, at maturity green or greenish-tawny, usually turning dark-colored in dry- 

 ing : perigynium large, very turgid at the base, gradually lengthened into a long- 

 conical slenderly toothed beak which much exceeds the scale. LUPULIN^E, 

 Tuckm. 



33. C. lupulina, Muhl. Tall and leafy (2 to 3 feet high) : fertile spikes 

 2 to 4, several to many-flowered, heavy, turgid-oblong or cylindrical, approxi- 

 mate or the lower remote and on more or less exserted stalks, becoming nearly 

 straw-colored at full maturity: bracts wide, long and leaf-like, the lower 

 sheathing : perigynium upright. Indian Territory and southward in wet 

 places. 



C. INTUMESCEXS, Rudge, distinguished by its few-flowered and aggregated 

 sessile, greener spikes, sheathless bracts, and more spreading perigynia, has a 

 similar range as the last, but has not yet been found within our limits. It 

 also occurs in British America. 



# # Staminate spikes commonli/ more than one : pistillate spikes usually long and 



densely cylindrical (short in No. 35 and occasionally in No. 38) : perigynium 

 smooth and shining, long-beaked, at maturity yellow or straw-colored, or occa- 

 sionally partly reddish purple. VESICARI.E, Tuckm. 



-i- Staminate spike one: pistillate spikes comose, cylindrical and drooping or 

 spreading : bracts sheathless or nearly so : beaks long. 



34. C. hystricina, Muhl. Plant rather slender, pale, 12 to 18 inches 

 high : spikes 2 to 4, narrow (f to 2 inches long and inch and less wide), nod- 

 ding or the upper one nearly erect or spreading, decidedly comose in appear- 

 ance: perigynium 15-nerved, not prominently inflated, prolonged into a very 

 slender and setaceously toothed beak, the lobes of which are spreading : scales 

 awn-like, shorter than the perigynium. C. Cooleyi and C. Thurberi, Dew. 

 Wet places, New Mexico and northeastward to Nebraska. Distinguished 

 from C. tentaculata, Muhl., which may occur within our southeastern bor- 

 der, by its smaller, more comose and more nodding spikes, and by its smaller 



