ORDER 154. CYPERACEJE. 367 



aarK-brown, in 1 or 2 small fascicles ; aeh. half the length of the eetse which equa. 

 the pointed serrulate tubercle. Maine to N. J., and W. Rare. Europe. 

 21 K. graclleiita Or. Tuftp 1 2f: culm and leaves threadform, curved ; spikes 

 1", brown, in 23 fascicles ; ach. oval, as long as its awl-shaped, serrulate tubercle, 

 shorter than the 6 setae. Low grounds, N. Y. to Fla. (B. fllifolia Torr.) 



15. CERATOSCHCENUS, Nees. Spikelets 2-5-flwd., one flower $ 

 the rest $ . Glumes loosely imbricated, somewhat in 2 rows, lower ones 

 empty. Perianth of 5 or 6 rigid, hispid, or scabrous setae. Stamen? 3. 

 Style simple, very long, persistent as a beak on the smooth, compressed 

 achenium. 11 Stems leafy, 3-angled, 2 4f. Cymes compound, brown. 



1 C. longirostris (Ell.) 3 6f; leaves flat, 46"; spikes in loose fascicles, 9"; 



ach. 2". beak 7". cetuR 5" ; cymes diffuse, terminal and axillary. Penn., W. and 8. 



2 . uijtrr>wta-lyiiN Torr. Leaves 2 4" wide; spikes 1", in dense fascicles; ach. 



and beak 8", sette 23", culm 2 3f. Hardly distinct. Mass., and South. 



3 C. rupitatH* Chapm. Spikes densely clustered in a few heads; beak only 2", 



ach. 1", setre 2'', culm teretish, 2 3f, leaves 24" wide. W. Fla. 



16. CLADIUM, Browne. Flowers 359. Glumes imbricated some- 

 what in i> rows, lower ones empty. Seta3 0. Stamens 2. Style 2-3-cleft, 

 deciduous. Achenium subglobous, the pericarp hard, thickened and corky 

 above. It Stem leafy. Cymes terminal and axillary, brown. 



1 <'. in jri.scoicle* (Mnhl.) Bog Rwh. Culm terete, rigid, 20 3(y ; leaves narrowly 



linear, much shorter than culm ; spikes 3", in pedunculate or sessile heads, forming 

 small cymes ; ach. ovoid, scarcely beaked. Bogs, N. Eng., and West. 



2 <!. oil'i.Mini (Swtz.). Saw Grass. Culm obtusely 3-angled, 6 lOf, leaves 3 lOfl 



sharply senate-barbed on the edges; cymes diffuse, decompound, forming a largo 

 panicle. A coarse, rank Sedge in ponds, N. Car. to La. 



17. HCLERIA, L. NUT SEDGE. Flowers 8 , staminate spikes inter- 

 mixed, fertile spikelets 1 -flowered, glumes fasciculate. Perianth cup-shaped 

 or 0. Achenium globous, ovoid or triangular, with a thick, bony pericarp. 

 Style 3-cleft, deciduous. If Culms 3-angled, leafy. Spikes in fascicles 

 Nuts white. In bogs. Summer. 



$ SCLERIA. Achenium ovoid or globous, base invested with a short perigynium. . .(*) 



* Achenium smooth, ovoid. Perianth annular, subentire. Stamens 3.. Nos. 1,2 



* Achenium rugous- warty, globular. Perianth 6- or 3-lobed Nos. 3, 4 



' Achenium reticulated or hispid-rugous, globular. Perianth 3-lobed Nos. 5, (5 



$ UTPOPOBUM. Acheninm ovoid-triangular, base fluted. Perigyninm none... (a) 

 a Fascicles 4 to 7, interruptedly spiked. Achenium smooth or rugous. .Nos. 7, 8 

 a Fascicles single, terminal. Achenium ribbed or smooth Nos. 9, '10 



1 S. trljjlomerata MX. Whip Grass. Culm erect, rough, 3 4f; leaves broad- 



linear, rough edged ; fascicles few, composed of triple clusters of green-brown (.",") 

 spikes; ach. white and polished, more than 1" in diameter. Common. 



2 S. leptoculmls W. Culm very slender, 2f, nearly naked ; Ivs. smooth, narrowly 



linear ; compound spikes loose, the lateral on a long filiform peduncle ; spikes 3 4"; 

 ach. pol shed, ovoid, minutely corrugated. S. (S. oligantha Ell.?) 



3 S. cillata MX. Culm scabrous above, 2f; leaves 2, pubescent, bracts ciliate- 



fringed ; ach. beset with unequal warts, disk 3-lobed. Pine barrens. S. 

 i S. paiicifldra. Muhl. Smoothish or hairy ; leaves and bracts exceeding the culm ; 



