748 ORDER 155. CYPERACE^E. 



Tho following account of our species of Carex is from tho pen of Prof. C. Dewey (D.D.), re- 

 vised by him expressly for the present Kdition. The annexed Analytical Table has been pre- 

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

 full set communicated by Dr. Sartwell), on the basis of the arth'cial subdivision of the genua 

 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 ditlicult genus in our Flora. 



N. B. In the specific descriptions the reader is often referred as follows : (Boott, illnst.)or (P. 

 t.). These refer by number to the Illustrations; of the Genus Oarex, in the recent splendid work 

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



I. STIO-MAS 2. ACHENIim DOUBLE-CONVEX. (*) 



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



dioecious, or spike with stamens at base No. 2, 3 



* B. Spikes several, androgynous (with both kinds of ilowers). (T) 



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



the whole spike t, .Spikes 4 to 8 Nos. 4 fi 



Spikes 10 to 20 Nos. T, S 



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



a Spikelets evidently paniculate and pericvninm 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 tho perigynium... Nos. 15 IT 



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



shorter than glume No. 21 



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



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



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



d Spike cylindrical, of8 to 15 spikelets Nos. 24, 25 



d Spike large, branched, of oo spikelets Nos. 26, 2T 



d Spikes elliptical, of S to 10 spikelets No. 2S 



t 8. Stamens at tho base of the spikelets. (e) 



e Perigynia radiating, in remote spikelets. Glumes green Nos. 29 31 



Glumes hyaline, white Nos. 3-J. :}'' 



Perigynia subercct, spikelets ovate-lanceolate, few-fruited Nos. 3436 



e Perigynia suberect, spikelets oval, (if) 



f Perigynia not winged, about equaling the hyaline or brown glume. . .Nos. 37, 33 

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



g Perigynia short-rostrate, shorter than the glume Nos. 89, 4i> 



equaling tho glume No. 41 



longer than the glume, (h) 



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



h Perigynia suberect or appressed Nos. 44 40 



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



longer than the glume Nos. 4S 5') 



* C. Sinminate and pistillate Jlmcers in separate spikes. (IT) 



t 4. Staminate spike single. S Spikes sessile, 1 or 2 only :.No. 51 



? Spikes sessile, 3 to 5 Nos. 52-54 



S Spikes pedunculate Nos. 65, 50 



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



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



1 Sterile spikes 1 or 2. Glumes all obtuse and black Nos. 5T, 53 



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



1 Sterile spikes 2 to f Glumes acutish or acute Nos. 62, G3 



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 3. ACHBNIU.U TRIQUKTKOUS. (*) 



* D. Spike* andngyniHH (with both kinds of ilowers). (T) 

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



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



Leaves several, linear or setaceous Nos. 6971 



H 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. 7476 



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



* B. Sin/cf,x<lii 'inutt, i. e., the fertile and sterile on different culms Nos. 78, 79 



* P. Terminal spite androgynous, pbttUatt 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. S3 



Spikes erect or nearly so. Glumes dark Nos. 84 S6 



Spikes drooping. Glumes acute, dark ..No. 87 



Glumes awned or cuspidate - . . .Nos. 889* 



* G. Staminate xpike single, entirely staminate. d) 



5 7. Pistillate spikes sessile or solitary, few, mnstly ovoid, fa) 



q Pistillate spikes oblong dark brown. S 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 



