748 Order 155.— OYPERAOE^ 



,Tltei folloTvinis; occount of our species of Carex Is from tho pen of Prof. C Dewey (D.D.), re- 

 vised by him oxi)re3sIy for the present Edition. The unnextiil Aiial\tic:il 'i'ublo has been pre- 

 pared by oursL-lves (with tho aid of copious and well authenticiitcd bpuciniens, atiiong which is a 

 full set coniinunicated by Dr. Sartwell), 07i the basts of the aitficial subdivibiun of tbu genus 

 adopted by Fiol'. Dewey in tho 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 

 floost extensive and diflicult genus iu our Flora. 



N. B. — In the specific descriptions tlie icadt-ris often referred as follows : (Boott, illnst.) or (B. 

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

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



S I. STIGMAS 2. AcHENItTM dottble-oonvkx. (*) 



• A. Spihe siTtgle^ — moncecious, etaminate at tho top No. 1 



— dicecious, or ? spike with fitanieus at base No. 2, 3 



• B. Spikes several, wndrogynous (with both kinds of flowers). (^) 



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



the wholo spike i. — Spikes 4 to 8 Nos. 4 — 6 



—Spikes 10 to 20 Nos. 7, 8 



^ 2. Stamens at the summit of the spikelcts, (a) 



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



a Spikelets 8 to 6, approximate into one spike, (b) 



b Spike ovate. — Glume equaling the perigynlum Nos, 11 — 13 



— Glume shorter than the perigynium No, 14 



b Spike oblong, a little loose. Glume shorter than tho perJ;;ynium...No3. 15 — IT 



a Spikelets 3 to 8, remote. Perigynium radiating, — longer than glume Nos. 13 — 20 



— shorter than glume No. 21 



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



C Perigynium rostrate, not longer than the glume Nos. 22, 28 



Perigynium rostrate. longer than the glume, (d) 



d Spike cylindrical, t)f8 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 



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



e Pcrigynia radiating, in rem{>to s[)ikelots. — Glumes green Nos. 29 — 31 



— Glumes hyaline, white Nos. 82,38 



e Pl-) i,rynia subercci. . ,'lkelets ovate-lanceolate, few-fruited Nos. 34—86 



e Perigynia suberect, bpikelets oval, (f) 



f Pcrjgynia not winged, about equaling the hyaline or brown glume. ..Nos. 87,83 

 f I'erigynia distinctly winged, broadly or narrowly, (g) 



g Perigynia short-rostrate,— shorter than the grume Nos. 89, 40 



— equaling the glume No. 41 



, — longer than the glume, (h) 



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



h. Perigynia suberect or appressed Nos. 44 -46 



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



— longer than tho glume Nos. 48 — 50 



• C. Siaminate and pUtillaie Jlowers in separate spikes. (H) 



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



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



— S Spikes pedunculate Nos. 55, 50 



T 5. Staminate spikes 1 or more and the s spikes often staminato 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, 53 



— Glumes, at least the lower, neute, brown Nos.59---Gl 



1 Sterile spikes 2 to 4. Glumes acutish or acute Nos. 62, 68 



k Glumes of the fertile spikes awned. (m) 



m Sterile spikes 1 or 2. Plants not maritime No?. C4y 65 



m Sterile spikes 2 or 8. Plants mail time Nos. €6, 67 



§ II. STIGMAS 3. AouBNiuM Tuicjuetrous. (*) 



• D. Spikes androgynous (with both kinds of flowers). {%) 

 ^ 5. Stamens at tlio summit of tlie 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. T4 — 76 



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



• E. Spikeff dicecious, i. e., the fertile and sterile on different culms Nos. 78, 79 



• F. Terminal npike androgynous, pifitillaie at top ; Hie otJiers pistillate, (p) 



p Perigynium hairy (at least, when young) as well a.s the Ivs., and bright-green. Nos. SO — 82 



p Perigynium smooth. — Spikes erect or nearly so. Glumes green No. 88 



— Spikes erector nearly so. Glumes dark Nos. 84--^ 



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



-^Ghimes awned or cuspidate Nos. 88—90 



• G. Staminate spi.ke single^ entirely staminate. (^) 



^ 7. Pistillate spikes sessile or solitai-y, few, mostly ovoid, (q) 



q Pistillate spikes oblong, dark brown. 3 Spikes stalked .^ No. 9t 



q Pistillato spikes ovoid,--all or mostly solitary .^ Nos. 92, 98 



— all sessile, approximate. Nos, 94, 95 



— all sessile, remote Nos. 96, 97 



