ORDEB 154 CYPERACE^E. 371 







2 C. gynocrates Wormesk. $ Spike oblong, rather loose-flowered ; perigynium 



oblong, short-beaked, longer than the ovate, acute, colored glume. N. Y!, Mich. 



3 C. exilis Dew. Spk. cylindrical, 1', dense, $ below, or wholly & or ? ; perig. ser- 



rulate on the margin, some longer than the ovate-lanceolate glume. Culm and leavea 

 filiform, stiffly erect, 1220'. Ms. to N. Y. and N. J. 

 )3. atttlrogyna. One or more small ? spikes below the terminal. N. Y. 



4 C. scirpoidea MX. Spk. oblong-cylindric (9 12") ; perig. oval, pubescent, longei 



than tin; ovate dark-purple glume. Leaves flat. 410'. N. H. to Mich. 



5 C. poly triclio ides Muhl. Spk. oblong, small (3"); perig. 38, erect, smooth 



twice longer than the ovate obtuse glume. Setaceous, 4 20'. Ms. to Wis. 



6 C. pauciflora Ltf. Spk. with about 4 slender reflexed $ fls. and 1 or 2 $ above 



twice longer than the lanceolate glume. Erect, 38'. N. England, New York. 



7 C. Boottiaua Benth. Culm 612' ; spk. oblong-cylindric, dioecious ; perig. hairy, 



obovate, smaller than the dark-purple glume. Ala. to La. 



8 C. \VilldenoTii Schk. Peduncles radical, filiform, 26' ; spk. small, $gls. above, 



4 8, ? perig. 5 9, scabrous, pointed, the glumes oftener long and bract-like, Leaves 

 1 2f, grassy. Dry grounds : common. 



9 C. Steudelii K. Peduncle radical, 18' ; spk. with 1015 $ glumes above and 2 



or 3 inflated pointed perigynia with long leafy glumes. N. Y., Pa., and W. 



10 C. Backii Boott. Ped. radical, i 3f, stiflf ; $ fls. about 3, above, ? perig. 2 4, 

 glabrous, round ovate, enclosed in the long leafy glumes. N. Y., O. , and N. 



11 C. Fraseri Sims. Culm 4 1(X, Ivs. 6-12' by 1', flat and thick; spk. oblong, 

 oo -flowered, perig. ovoid, longer than the hyaline, obtuse glume. Wytheville, Va. 



(Shriver) and Mts. of N. C. A curious and peculiar Carer. Leaves very large. 



12 C. stcrilis Willd. Culm (and Ivs.) slender, erect, 1 2f; oftener dioacions; spks. 

 3 6, roundish, approximate, i spikes oblong ; perig. radiating, ovate, subrostrate, 

 2-toothed, about equaling the ovate acutish glume. Common in wet.places. 



13 C. bromoides Schk. Slender, weak, 1 2f; spikes 46, distinct, lanceolate; 

 perig. lanceolate, erect, acuminate, longer than the lanceolate gls. Bogg : common. 



14 C. siccata Dew. Erect, 1 2f ; spks. 3 7, oral to oblong, $ above, or the middle 

 all i ; perig. lance-ovate, beaked, as long as the brownish gls. Sands, N. Eng. to 111. 



15 C. disticha Huds. (C. Sartwellii Dew.) Erect, 2 3f; spks. 1220, the lower 

 some remote, all ovoid and compact, stam. mostly above ; perig. ovate, lanceolate, 

 pointed, equaling the ovate pointed glume. Seneca Co., N. Y. (Sartwell), and W. 



16 C. decoraposita Muhl. Culm erect, 1836'; spikes very many, in a large 

 crowded panicle ; perig. round-obovate with a very short beak, biconvex, about 

 equaling the ovate glume. N. Y. to Mich., and S. 



17 C. prairea Dew. Culm 2 3f; spikes many, in a dense short (34') panicle; 

 perig. erect, lance-ovate, smaller than the glume. N. Eng., and W. 



18 C. teretiuscula Good. Spikelets roundish, dense, in a cylindrical compound 

 spike 12' ; perig. brown, corky, ovate, biconvex, short-beaked, diverging ; culm 

 1J 3f; leaves narrowly linear. Common in wet places, northward. 



IOC* vulpinoidea MX. Spikelets very many, dense, ovoid, in a large (2 3') com- 

 pound spike ; perig yellowish, very small ($"), ovate, acuminate, diverging, scarcely 

 as long as the pointed glume ; culms stout, 2 3f. Common. 



/3. setacea. Perig. narrower, erect, in a more slender compound spike. 



y. sctibrior (Sartwell). Spikes distinct or remote, glume strongly serrulate. 



20 C. conjuiicta Boott. Spikelets in a long (3') subsimple spike; perig. orate, 

 eubcordate and corky at base, short-beaked ; sryle bulbous at base ; nut orbicular; 

 culm weak, 1 2f, flattened. Ohio, and westward. (C. vulpina C-B.) 



21 C. alopecoidea Tuckm. Spikelets 8 12, in an oblong 1 '2' spike ; perig. ovate ; 

 nerveless, brown, 1", subrostrate ; culm 3-angled, 2 3f. N. Y., Pa., and W. 



22 C. stipata Muhl. Spike often decompound, 23', spikelets oo, oblong; perig. 



