748 ORDER 155. CYPEEACE^. 



The following account of our species of Cares Is from the pen of Prof. C Dewey (D.D.), re- 

 vised by him expressly for the present Edition. The unnexpd Analytical Table has been pre- 

 nared by ourselves (with the aid of copious and well authenticated specimens, among which is a 

 full set communicated by Dr. Sartwell), on the basis of the artficial subdivision of the genus 

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

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

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

 most extensive and difficult genus in our Flora. 



N B In the specific descriptions the reader is often referred as folloAvs : (Boott, illust.) or (B. 

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

 of Francis Boott, M.D., President of the Liunaeau Soc. of England. 



I. STIGMAS 2. ACHENIUM DOUBLE-CONVEX. (*) 



* A. Spike single, monoecious, staminate at the top V, .' o 



dioecious, or 9 spike Avith stamens at base No. 2, 9 



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



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



the wholo spike $ .Spikes 4 to 8 Nos. 46 



Spikes 10 to 20 Nos. 7, 8 



T 2. Stamens at the summit of the spikelets. (a) 



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



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



b Spike ovate. Glume equaling the perigynium Nos. 1113 



Glume shorter than the perigynium No. 14 



b Spike oblong, a little loose. Glume shorter than the perigynium. ..Nos. 1517 



a Spikelets 3 to 8, remote. Perigynium radiating, longer than glume Nos. 1820 . 



shorter than glume No. 2t 



a Spikelets 8 to CO , approximate in a decompound spike, (c) 



C Perigynium rostrate, not longer than the glume Nos. 22, 23 



Perigynium rostrate, longer than the glume, (d) 



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



d Spike large, branched, of CO spikelets Nos. 26, 27 



d Spikes elliptical, of 8 to 10 spikelets No. 28 



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



e Perigynia radiating, in remote spikelets. Glumes green Nos. 2931 



Glumes hyaline, Avhite Nos. 32, 33 



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



6 Perigynia suberect, spikelets oval, (f ) 



f Perigynia not Avinged, about equaling the hyaline or brown glume. . .Nos. 37, 38 

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



g Perigynia short-rostrate, shorter than the glume Nos. 39, 40 



equaling the glume No. 41 



longer than the glume, (h) 



h Perisrynia spreading (not radiate) Nos. 42, 43 



h. Perig ynia suberect or appressed Nos. 44 46 



g Perigynium *long-rostrate, equaling the glume No. 47 



longer than the glume Nos. 48 50 



* C. Staminate and pistillate flowers in separate spikes. (H) 



^ 4. Staminate spike single. 9 Spikes sessile, 1 or 2 only No. 51 



" 9 Spikes sessile,3to5 Nos. 52 54 



9 Spikes pedunculate Nos. 55, 56 



IT 5. Staminate spikes 1 or more and the 9 spikes often staminate at summit, (k) 

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



1, Sterile spikes 1 or 2. Glumes all obtuse and black Nos. 57, 58 



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



1 Sterile spikes 2 to 4. Glumes acutish or acute Nos. 62, 63 



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, 67 



II. STIGMAS 8. ACHENIUM TRIQUETROUS. (*) 



* D. Spikes androgynous (Avith both kinds of flowers). (^) 

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



n Spikes single. Leaves 2, broad, flat, with no midvein No. 68 



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 the fruit long and leaf-like Nos. 7476 



IT 6. Stamens at the base of the 1 or more spikes No. 77 



* B. Spike* <f*c&w*, i. e., the fertile and sterile on different culms Nos. 78, 79 



* 3P. Terminal spike androgynous, pistillate at top ; the others pistillate, (p) 



p Pcrisynium 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 erect or nearly so. Glumes dark Nos. 84 86 



Spikes drooping. Glumes acute, dark No. 87 



Glumes awned or cuspidate Nos. 88 90 



* G. Staminate spike single, entirely staminate. (T) 



5 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, 97 



