360 ORDER 154. CYPERAOE^E. 



N, 



a Glumes many, rounded, coriaceous. Culm stout. Spike 12' NOB. 18 



a Glumes few, oblong, thin. Culm slender. Spike J~l' No*. 4, 



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

 b Spike brown or the glumes with tawny side?, white-edged.. ,(c) 



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



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

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



d Acheninm flattened, smooth, style 2- { x Spike lance-shaped Nos. 9, 10 



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

 e Setae 46, retrorsely barbed, longer than y dotted acheiiium.. .Nos. 14, 21 



y smooth achenium... Nos. 15, 1C 



e Sefee 02 6, smoothish, shorter than the achenium Nos. 17 20 



z Culms often proliferous (i. 0., bearing young culms at top).. . .Nos. 21, 22 

 z Culms never proliferous, only 26' high Nos. 23, 24 



1 E. equisetoides Torr. Culm terete, many jointed, 2 3f, as thick as the spike ; 



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

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



2 E quadrangulata Br. Culm 2 4f, joiutless, acutely 4-angled with the sides 



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

 distinct tubercle ; setae G. Bogs, N. Y., W. and S. Rare. 



3 E. cellulosa Torr. Culm 2f, obtusely 3-angled below, jointless ; spike 1', glume* 



round ; setae 6 ; ach. broad-obovate, deeply pitted. Marshes, Fla. to La. 



4 E* Robbinsii Oakes. Culms slender, IK 2f, sharply 3-angled, many of them abor- 



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

 flowered ; ach. 1", half as long as the 6 setse. Ponds. Rare. 



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



abortive ones ; spike 12-20-flowered ; ach. and setae a? in No. 4. Ponds, S. 



6 E. capitata Br. Culms tufted, 3 G', striate ; spike ovate, 1 2" ; glumes 10 15, 



whitish-scarious, oblong, deciduous ; ach. black, shining ; setae 6. Ga., Fla. 



7 E. ulbida Torr. Culm and whitish spike much like E. capitata. but the glumes be 



come 1020, the style 3-cleft and achenium tumid, brown. Ga. ( Fla.. La. 



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



GO, very obtuse ; ach. scarcely larger than its arrow-shaped tubercle. Swamps. 



9 E. pal&stris Br. Rhizome creeping; culms 0' 2f, with a long sheath; spike lance- 



oblong, 3 (59''; glumes reddish-brown, very numerous, oblong-ovate; with a broad 

 scarious margin ; ach. obovate, yellowish ; seta} 4. Common. 

 |3. calt-a. Bristles wanting ; culms filiform. Watertown, N. Y. 



10 E. compressa Sull. Culms tufted, very erect, narrow-linear, 1 l|f; spike 

 oblong-ovoid, 3 5"; gls. 10 30, ov. -lanceolate, brown ; ach. yellow; seta3 0. M., W. 



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

 very many and close, red-brown, white-edged ; seta? f> ; style often 3-cleft. Common. 



1 2 E. olivaoea Torr. Culms 24', densely tufted, spreading, flattened and stri- 

 ated ; !-pike ovate, acutish, 23" ; glumes 2.1 30, green -brown ; ach. olive. Sands. 



13 E. ovala Br. Culms tufted, 610', finely striate; spike exactly ovoid, 23"; 

 glumes 2030, rounded, tawny, with 2 white striae ; ach. ivory-white, pyriform-com- 

 presscd, capped with a brown tubercle ; seta; 7, long. E. Penn. (H. Jackson.} 



1 4 E. simplex Torr. Culm acute-angled, filiform, 12 18'; spk 2 3", ovoid; glumes 

 ovate, white-edged, few ; ach. olive-green, much larger than its tubercle. Md.,andS. 



15 E. rostellata Torr. Culm 12 20 7 , sulcate. rigid, very slender ; spike lance-ovate, 

 acute, 34" ; glumes 1220 ; ach. olive-brown, tubercle a mere beak. E. and N. 



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

 spk. oblong-ovate, acute, 13"; gls. oblong, obtuse, 12 Q5, with 2 brown lines; ach. 

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



IT E. mrlaiiocarpa Torr. Culm flat, etriate, wiry, erect 1218'; spike lance- 



