360 ORDER 154. CYPERACE^E. 



a Glumes many, rounded, coriaceous. Culm stout. Spike 12' Nos. 1 fl 



a Glumes few, oblong, thin. Culm slender. Spike |~1' Nos. 4, 5 



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

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



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. ..fe) 



d Achenium flattened, smooth, style 2- 1 x Spike lance-shaped Nos. 9, 10 



cleft (3-2-cleft in No. 11.) f x Spike globous or ovate. Nos. 11 13 

 e Setae 4 6, retrorsely barbed, longer than y dotted acheuium.. .Nos. 14, 21 



y smooth achenium.. Nos. 15, 36 



e Setee 026, smoothish, shorter than the acheniura Nos. 17- 20 



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



z Culms never proliferous, only 2 & 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, jointless, acutely 4-angled with the sides 



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

 distinct tubercle : setae 6. Bogs, N. Y., W. and S. Rare. 



3 E. cell ulosa 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. Robbiiisii Oakes. Culms slender, 9' 2f, sharply 3-angled, many of them abor- 



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

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



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



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



6 E. capitata Br. Culms tufted, 36', striate ; spike ovate, 12" ; glumes 1015, 



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



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



come 10 20, the style 3-cleft and achenium tumid, brown. Ga., Fla., La. 



8 E. tuberc ulosa Br. Culms angular, wiry, 10 15 7 ; spike 3 5", lance-ovate ; gig. 



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



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



oblong, 3 6 9'' ; glumes reddish-brown, very numerous, oblong-ovate; with a broad 

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

 /3. calva. Bristles wanting ; culms filiform. Watertown, N. Y. 



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

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



1 1 E. obt lisa Schultes. Culm 6 16' ; spike ovoid, very obtuse, 2 4" ; gls. ovate, 

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



12 E. ollvacea Torr. Culms 2 4', densely tufted, spreading, flattened and stri- 

 ated ; spike ovate, acutish, 2 3" ; glumes 2.) 30, green-brown ; ach. olive. Sands. 



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

 glumes 20 30, rounded, tawny, with 2 white striae ; ach. ivory-white, pyriform-com- 

 pressed, capped with a brown tubercle ; setae 7, long. E. Penn. (H. Jackson.) 



1 4 E. simplex Torr. Culm acute-angled, filiform, 1218'; spk. 23", ovoid ; glumes 

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



1 5 E. rostellata Torr. Culm 12 20 / , sulcate. rigid, very slender ; spike lance-ovate, 

 acute, 34"; glumes 12 20 ; ach. olive-brown, tubercle a mere beak. E. and N. 



16 E. intermedia Schultes. Wiry setaceous culms 38', spreading, in dense tufts ; 

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

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



17 E. melanocarpa Torr. Culm flat, etriate, wiry, erect. 1218'; spike lance 



