368 



ORDER 154. CYPERACE^E. 



fascicles few-flowered, the lateral, if any, pedunculate ; ach. small, rough, the die* 

 6-lobed. Rare northward, common South. 10 16'. 



/3. g-labra, Smoothish, slender, If; lateral fascicles 1-flowered, or 0. Ms. to Ohio. 

 7. Carollnlana. Scabrous-hirsute, slender; leaves much exceeding the culm. 8. 

 5. fUliotm. Stout, 8 3f, denticulate-ciliate ; lateral spikes pedunculate. S. 

 5 S. reticularls MX. Slender, If, leaves shorter than culm; fascicles 2 5, distant, 



stibsessile ; ach. dead-white, f ', conspicuously netted and pitted. R. I. to Fla. 

 G S. laxa Torr. Slender, weak, diffuse, 1 2f ; Ivs. flat, 2" wide ; fascicles very remote, 

 spks. distant, in pairs ; ach. 1", with transverse ridge? and brown pits. N. J. to Fla. 



7 !S. verticillikta Muhl. Glabrous, 6 12', slender; fascicle 4 6, smooth, purple, 



sessile. " 1' apart ; ach. globular, about f", rugous. N. Y to Ohio, and South. 



8 S. iiiterrupta Ms. Sparingly birsute, 12 W ; leaves 2" wide; fascicles 5 7, 



rusty-brown, sessile, ciliate, 4 9" apart; ach. smooth, \" diameter. South. 



9 S. gracilis Ell. Filiform, smooth, 1 2f; spikes few (15 pairs), 3", in a terminal 



fascicle; bract erect; ach. ovid-triangnlar, ribbed lengthwise. South. 



10 S. Baldwinii (Torr.) Culm scape-like, 2 3f, leaves all radical, long ; spikes 5" 

 long, 3 5 pairs in a terminal fascicle, brown-purple, with 3 bracts, middle bract erect ; 

 ach. dull-white, 2'' long, even. In Georgia and Florida. 



18. CHAETOSFORA, R. Br. Spikes 1-5-flowered, fls. $ , glumes in two 

 rows, the lower empty. Setse 3 6. Stam. 3. 



Style 3-firl, deciduous. Achenium triangular. 

 U Culm leafy only at base. Fls. capitate, 

 chesi nut-brown. 



C. nigrlcaiis K. Culm If, erect, teretish, longer 

 ttian the narrow erect leaves ; spikes 4" long, in 

 one fascicle, bract erect, 1 3' ; achenium J" 

 diameter, white. Fla., Eur. 



19. CAREX, L. Flowers diclinous. Spks. 

 1 or more, either with both staininate and 

 pistillate flowers (androgynous), or with the 

 two kinds in separate spikes on the same plant 

 (mon(Kcious\ or rarely on separate plants (dias- 

 cious). Glumes single, imbricated, each 1-flwd. 



S Stamens 3. S Stigmas 2 or 3. Nut (ache- 

 nium) 2-cdged or 3-angled, enclosed in a sac 

 (perigyniuiri) composed of 2 united glumes. 

 U Culms triangular, in tufts, with grass-like 

 leaves and usually with axillary as well as 

 terminal spikes. 



The following enumeration of our Carices 

 is reduced from the excellent monograph by 

 the lamented Prof. C. Dewey, contained in the 

 Class-book of Botany, and revised with the 

 assistance of frieml before mentioned, and 

 whose names appear below. 



Fig. 13, C. flava. 14, One of its perigyuia 

 (magnified) : 15, a glume. Fig. 16, C. rosea. 

 17, A perigy nium : 18, a glume. 



