. 748 Order 155.— CYPBRAOE^. 



Tha following account of our speciea of Carex is from tho pen of Prof, C. Dewey (D.,D.)» 'o* 

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

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

 full set comraunicatetl by Dr. Sartwell), on the basis of the artflcial subdivision of the genus 

 adu;jEod 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 diflScuIt genus in our Flora. 



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

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

 of Francis Boott, M.I)., President of the Linnaau Soc. of England. 



§ I. STIG-M'AS 2. AOIIENHJM dou-ble-convbx. (*) 



* A. Spike single^ — monoecious, staminate at tlje top No. 1 



— dicecious, or s spike with stamens at base No. 2, S 



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



.^ 1. titaijiena variously situated, above, below, or in tho middle, sometimes 



the whole spike $. — Spikes 4 to 8 Nos, 4 — G 



—Spikes 10 to 20 Nos. T, 8 



^ 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. 11 — ^13 



— Glume snorter than tho perigynium No. 14 



b Spike oblong, a little loose. Glumo shorter than the perigynium... Nos. 15 — ^17 



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



— shorter than glume .' .No. 21 



a Spikelets 8 to 03 , approximate in a decompound spike, (c) 



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



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



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



d Spike large, branched, "f 00 spikelets Nos. 26, 27 



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



^ S. Stamens at the base of tho spikelets. (e) 



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



— Glumes hyaline^ white Nos. 82, 38 



e Perigynia suborcct, spikelets ovate-lanceolate, few-fruited Nos. 34—36 



e Pciijiynia suborcct, spikelets oval, (f ) 



f l*crigynia not winged, about equaling the hyaline or brown glume. . .Nos. 37, SS 

 f Perigynia distinctly winged, broadly or nari'owly. (g) ' 



g Perigynia sliort-roatrate, — shorter than the gmme Nos. 39, 40 



— equaling the glume No. 41 



— longer than the glume, (h) 



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



h, Perigynia subcrect or appressed Nos. 44-— 46 



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



— longer than the glume Nos. 48 — 50 



* C. Staminate and 2ny'<tiU(ite Jlowers in sepn-rate spikes. (IT) 



I 4. Staminate spike single. — ? Spikes sessile,' 1 or 2 only No. 51 



— ? Spikes sessile, 8 to 5 Nos. 52—54 



— ¥ Spikes pedunculate Nos. 55, 56 



TT 5. Staminate spikes 1 or more and the 9 spikes often staminate 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^ 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 



§ H. STIGMAS 3. AouENiiTM Tiuqitetuous. (*) 



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



II 5. Stamens at tlie summit of tho spike, (n) 



n Spikes single.— Leaves 2, broad, flat, with nomidveiu 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. 74—76 



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



* E. Spikes dio&cious, i. e., the fertile and sterile on different' culms Nos. 7s!79 



* W. Terminal spike androgynous, piftUUate at top ; the others pistiUate. (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. 84-^6 



—Spikes drooping.— Glumes acute, dark No. 8T 



^ „ _, . , ., —Glumes awned or cuspidate ...Nos, 88-90 



* G-. Stamznate spike single^ eniireh/ staminate. (T) 



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



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



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



— all aosslle, approximate Nos." 94 95 



— all sessile, remote Nos* 96 97 



