748 Order 155.— CYPERAClfLE. 



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

 vised by him expressly for tho present Edition. The annexed Analytical Table lias been pre- 

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

 full set communicated by Dr. Sartvvell), on the busts- of the artflcial subdivision of the genus 

 adopted by Prof. 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 tho study of this the 

 most extensive and difficult genus in our Flora. 



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

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

 of Francis Boott, M.D., President of tho Limucan Soc. of England. 



$ I. STIOMA3 2. AoiiENir/M double-convex. (*) 



* A. Spike A'mpZ^,— nionoacious, staminate at tlio top.. No. 1 



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



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



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



tho whole spike £ . — Spikes 4toS Nos. 4 — 5 



—Spikes 10 to 2 J .Nos. 7, 8 



*[ 2. Stamcnsat tho summit of the spikelets. (a) 



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



a Spikelets 3 to C, approximate into ono spike, (b) 



b Spike ovate. — Glume equaling tho perigynium.. Nos. 11 — 15 



— Glume shorter than the perigynium No. 14 



b Spike oblong, a little loose. Glume shorter than tho perigynium. ..Nos. 15 — 17 



a Spikelets 3 to 8, remote. Porigynium radiating, — longer than grume Nos. 1* — 20 



— shorter than glume No. 21 



a Spikelets S to CO , approximate fn a decompound spike, (c) 



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



a Perigynium rostrate-, longer than the glume, (d) 



d Spike cylindrical, of 8 to 13 spikelets Nos. 24, 25- 



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



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



S 8. Stamens at tho baso of the- spikelets. (e) 



e Perigy nia. radiating, in remote spikelets.— Glumes green Xos. 29 — 31' 



— Glumes hyaline, white Nos. 82, SB 



e Porigy nia- subereet, spikelets ovate-lanceolate, few-fruited Nos. 34— 36. 



O Perigynia subereet, spikelets oval. (t'> 



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

 t* Perigynia distinctly winged, broadly or narrowly, (g) 



g Perigynia short-rostrate, — shorter than the glume Nos. 39. 4l> 



— equaling the glume. No. 41 



— longer than the glume, (h.) 



h. Perigynia spreading (not radiate).. Nos. 42, 4$ 



h. Perigynia subereet or appressed Nos. 44 — 46. 



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



—longer than tlio glume Nos, 4S — 5!> 



* C. Shtmuiate and pistillate flower's in separate spikes. (1T) 



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



— ¥ Spikes sessile, 3 to 5 Nos. 52—54 



— ¥ Spikes pedunculate Nos. 55, 56- 



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



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



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



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



I Sterile spike* 2 to 4. Glumes acutish or acute Nos. C2, 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. CO, 07 



| II. STIGMAS 3. Acur.NiuM Tiuquetrous. (*> 



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

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



■n. Spikes single. — Leaves 2, broad, flat, with no mid vein No. 6$ 



— Leaves several, linear or setaceous Nos. 69 — 71 



U 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— 75 



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



* E. Spikes dios.iotis, i. e., the fertile and sterile on different culms Nos. 7S, 79t 



* F. Terminal xpike androgynoux, pistillate at top ; the others pistillate, (p) 



p Perigynium hairy (at least, when- young) as well as the 1 vs., and bright-green. Nos. 80 — 82 



p Porigy taunt- smooth. — Spikes erect or nearly so. Glumes green No. 8# 



— Spikes erect or nearly so. Glumes dark Nos. S4 — SG 



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



— Glumes awned or cuspidate . Nos. 88 — 90 



* G. Staminate spike single, entirety staminate. (1) 



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



<j Pistillate" spikes oblong, dark brown, i Spikes stalked No. 91 



q Pistillate spikes ovoid, — all or mostly solitary Nos. 92, 9$ 



— all sessile, approximate Nos. 94, 95 



— all sessile, remote Nos. 96, 97 



