743 ORDER 155. CYPERACEJ3. 



ring account of our species of Carex is from tho pen of Prof G. T)ewey (D.D.), re- 



i expressly for the present Edition. The annexed Analytical Table has been pre- 

 i-selves (with the aid of copious and well authenticated specimens, among which is a 



Tho folloT 

 vised by him e> . 



FuTl^ct^communicated by Dr. Sartwe'll). on t/te limis of the artficial subdivision of the genus, 

 adopted by Prof. Dewey in the former edition. It is useless to admonish the student that thi* 

 table is not perfect, and may sometimes lead him astray. Yet, in tho main, its subdivisions aro 

 correct, and cannot fail to lead to correct results, and thus greatly facilitate the study of this tho 

 most extensive and difficult genus in our Flora. 



ff. jj. in the specific descriptions the readeris often referred as follows : (Boott t illnst.)or (I>. 



t ). 'These refer by number to the Illustrations of the Genus Carex, in the recent splendid wwik 

 of 'Francis Boott, iIJX, President of the Liunaean Soc. of England. 



I. STIG-MAS 2. ACHENIUM DOUBLE-CONVEX. (*) 



* A. Spike single, monoecious, staminate at the top., No. 1 



dioecious, or $ spike -with stamens at base No. 2, 5 



* B. Spikes several, androgynous (with both kinds of flowers). (^) 



^ 1. Stamens variously situated, above, below, or in the middle, sometimes 



the whole spike & .Spikes 4 to 8 Nos. 46 



Spikes 10 to 20 Nos. 7, * 



^ 2. Stamens at the summit of the spikclets. (a) 



a Spikelets evidently paniculate and perigyimim not rostrate Nos. 9, 10 



a Spikelets 3 to 6, approximate into one spike, (b) 



b Spike ovate. Glume equaling the pcrigynium Nos. 11 15 



Glume shorter than the perigynium No. 14 



b Spike oblong, a little loose. Glume shorter than the perigynium...Nos. 15 IT 



a Bpikelets 3 to 8, remote. Perigynium radiating, longer than glume Nos. IS 20 



shorter than glume No. 21 



a Spifcclets S to OO , approximate in a decompound spike, (c) 



C Perigynium rostrate, not longer than the glume Nos. 22, 255 



C Perigynium rostrate, longer than the glume, (d) 



d Spike cylindrical, of 8 to 15 spikelets Nos. 24, 25 



d Spike large, branched, of GO spikelets Nos. 26, 21 



d Spikes elliptical, of 8 to 10 spikeleta No. 2* 



^ 8. Stamens at the base of the spikelets. (e) 



6 Perigynia radiating, in remote spikelets Glumes green Xos. 29 SI 



Glumes hyaline, white Nos. 82, J>> 



e Perigynia suberect, spikelets ovate-lanceolate, few-fruited Nos. 3436 



e Perhrynia suberect, spikelets oval, (f ) 



f Perigynia not winged, about equaling tho hyaline or brown glume . . .Nos. 8T, 8* 

 f Perigynia distinctly winged, broadly or narrowly, (g) 



g Perigynia sh'ort-rostrate, shorter than the glume Nos. 89, 40 



equaling the glume No. 41 



longer than the glume, (h.) 



h Perigynia spreading (not radiate) Nos. 42, 45 



~h Perigynia suberect or appressed Nos. 44 4ft 



g Perigynium "long-rostrate, equaling the glume No. 4T 



longer than the glume Nosv 48 5-> 



* C. Staminate and pistillate flow era in separate spikes. (IT) 



T 4. Staminate spike single. ? Spikes sessile, 1 or 2 only No. 51 



? Spikes sessile, 3 to 5 Nos. 5254 



$ Spikes pedunculate Nos. 55, 5(5 



IT 5. Staminate spikes 1 or more and the s spikes often stamiuate at summit, (k) 



k Glumes awnless, mostly obtuse and dark colored. (1) 



1 Sterile spikes 1 or 2. Glumes all obtuse and black Nos. 57, 5S 



Glumes, at least the lower, acute, brown Nos. 59 61 



1 Sterile spikes 2 to 4. Glumes acutish or acute Nos. 62, 6& 



k Glumes of the fertile spikes awned. (m) 



m Sterile spikes 1 or 2. Plants not maritime Nos. 64, 65 



m Sterile spikes 2 or 3. Plants maritime Nos. 66, 6T 



8 II. STIGMAS 3. ACIIENIUM TKIQUKTROCS. (*) 



* D. Spike* androgynous (with both kinds of flowers). (^) 

 If 5. Stamens at the summit of the spike, (n) 



n Spikes single. Leaves 2, broad, flat, with nomidvein No. fiS 



Leaves several, linear or setaceous Nos. 69 71 



n Spikes several, some of them on long, radical peduncles, (o) 



O Glumes of the fruit not longer than the perigynia Nos. 72, 73 



O Glumes of tho fruit long and leaf-like Nos. 74 76 



IT 6. Stamens at the base of the 1 or more spikes No. 7T 



* E. Spike* di&cioug, i. e., the fertile and sterile on different culms Nos. 78, 79 



* F. Terminal npike androgynous, pistillate at top ; the others pistillate, (p) 



p Perigynium hairy (at least, when young) as well as thelvs., and bright-green. Nos. 80 82 



p Perigynium smooth. Spikes erect or nearly so. Glumes green No. 83 



Spikes erector nearly so. Glumes dark Nos. 8486 



Spikes drooping. Glumes acute, dark No. 8T 



Glumes awned or cuspidate Nos. 88 90 



* G. Staminate ttpike single, entirely staminate. (^) 



1 7. Pistillate spikes sessile or solitary, few, mostly ovoid, (q) 



q Pistillate spikes oblong, dark brown. $ Spikes stalked No. 91 



q Pistillate spikes ovoid, all or mostly solitary Nos. 92, 93 



all sessile, approximate Nos. 94, 95 



all sessile, remote Nos. 96, 9T 



