360 VJHUKU 154. CYPERACEJi. 



a Glume* muny. rounded, coriaceous. Culm float. Spike 1 2' Nos. 1 1 



a Glume* few, oblong, thin. Culm slender. Spike J- V No?. 4, 5 



b Spike white or greenish- white, ovoid, 23". Ach. blackish. 8. .Nos. 6, 7 

 b Spike brown or the glumes with tawny sides, white-edged.. .(<;) 



c Tubercle nearly as large as the ribbed and dotted achenium No. 8 



c Tubercle much smaller than the achenium.. .(d) 

 d Achenium 3-angled or tumid, style always 3-cleft. ..() 



d Achenium flattened, smooth, style 2- ix Spike lance-shaped Nos. 9, 10 



cleft (3-2-cleft in No. 11.) t X Spike globous or ovate. Nos. 1113 

 e Setse 46, retrorsely barbed, longer than y dotted achcuium.. .Nos. 14, 81 



y smooth achenium.. Nos. 15, 1C 



e Setie 026, smoothish, shorter than the achenium Nos. 17- 20 



z Culms often proliferous (i. e., bearing young culms at top) Nos. 21, 22 



z Culms never proliferous, only 2 6 / high Nos. 23, 24 



1 E. equine to id eg Torr. Culm terete, many jointed. 2 3f, as thick as the ppike ; 



sheath at base obtuse; spike 1', acute, glumes very obtuse; setse 6: style 3-cleft; 

 ach. smooth, brown. Bogs, R, I., W. and S. 



2 E. qiiadraugulata Br. Culm 2 4f, jointless. acutely 4-angled with the sides 



unequal; spike 12'; glumes obtuse; ach. dull white, obovoicl, tipped with the 

 distinct tubercle : setse (>. Bogs, N. Y., W. aiid 8. Rare. 



3 E. <>ellulo*a Torr. Culm 2t'. obtusely 3-angled below, jointless; spike 1', glun-.es 



round : setse 6 : ach. broad-obovate, deeply pitted. Marshes, Fla. to La. 



4 E. Kobbinsll Oakes. Culms slender, !(' 2f. sharply 3-angled, many of them abor 



the and splitting into hair-like fibres in the water: spikes 6 9', spindle-form, 5-8- 

 (lowered : ach. 1", half as long as the 6 setse. Ponds. Rare. 



5 E. cloimala Chapm. Culms floating, very long and slender, with many hair-like 



abortive ones : spike 12-00-flowered ; ach. and setse a# in No. 4. Ponds, S. 



6 E. capilata Br Culms tnfted, 3 6', striate ; spike ovate. 1 2"; glumes 10 15, 



wli-itish-scarious. oblong, deciduous ; ach. black, shining ; setje (i. Ga.. Fla. 

 1 E. ttlbida Torr. Culm and whitish spike much like E. capitara. but the glumes be 

 conn- ID -0. the style 3-cleft and acheuium tumid, brown. Ga.. Fla.. La. 



8 E. tuberciilbsa Br. Culms angular, wiry, 1015'; spike 3 5", lance-ovate ; gls. 



GC. very obtnue; ach. scarcely larger than its arrow-shaped tubercle. Swamps. 



9 E. paltstrls Br. Rhizome creeping; culms !l'2f, with a long sheath ; spike lance- 



oblong. 3 t> 9 ' ; glumes reddish-brown, very numerous, oblong-ovate ; with a broad 

 scarious margin ; ach. obovate, yellowish ; setse 4. Common. 

 B. rali a. Bristle* wanting ; culms filiform. Watertown, N. Y. 



10 E. oonipr. sa Sull. Culms tufted, very erect, narrow-linear, 1 IJf; spike 

 oblong ovoid. 3 5" : gls. 10 30, ov. -lanceolate, brown ; ach. yellow; setae 0. M., W. 



1 1 E. obtusa Schultes. Culm 6 16'; spike ovoid, very obtuse, 24" ; gls. ovate, 

 very many and close, red-brown, white-edged ; setae 6 ; style often 3-cleft. Common. 



12 E. olivarea Torr. Culms 2 \', densely tufted, spreading, flattened and stri- 

 ated: spike ovate, acutish, 23" ; glumes 2 i 3ft, green-brown ; ach. olive. Sands. 



13 E. ovata Br. Cn'ms tufted, 610'. finely striate; spike exactly ovoid, 2 3"; 

 glumes 2ii 3D, rounded, tawny, with 2 white striae; ach. ivory-white, pyrii'onu com- 

 pressed, capped with a brmvn tubercle ; setae 7, long. E. Penn. (ff. Jackson.} 



I I E. simplex Torr. Culm acute-angled, filiform, 12 18'; spk 2 3", ovoid ; glumes 



ovate, \\hite-eriged, few ; ach. olive-green, much larger than its tubercle. Md.,andS. 

 l> E. rostellata Torr. Culm 12 20 7 , sulcate. rigid, very slender ; epike lance-ovate, 



acute, 3--4"; glumes 12 20 ; ach. olive-brown, tubercle a mere beak. E. and N. 

 16 E. intermedia Schultes. Wiry setaceous culms 3 8', spreading, in dense tufts , 



spk. oblong-oviite, acute, 13" ; gls. oblong, obtuse, 12 25, with 2 brown lines ; ach. 



smooth, obovoid. light-brown, with a distinct conical brown tubercle. In wet bank*. 

 I 7 E. melaiiocarpa Torr. Culm flat, striate, wiry, erect. 12 18'; spike lance 



