Carex. CLX. CYPERACE^. 677 



A. Spike single. 2. Dlcecious. 



2. C. Davalliana. Smith. 



Spike oblong, rather loose-flowered; perisr. ovate-lanceolate, attenuate, 

 convex, terete, recurved, longer than the ovate glume; st. and lis. are usually 

 serrulate. — Wayne Co., N. Y., SartweU. 



3. C. ExiLis. Dewey. 



Fcrtik spike ^ below, ovate, rather densel3"-flowered ; perig. ovate-lanceo- 

 late, convex on both sides, diverging, serrulate on the margin, a little longer 

 than the ovate, acute glume; Ivs. setaceous; st. 12 — 20' high. — Grows in Dan- 

 rers and Ipswitch, Ms., Oakcs, in N. Y. and N. J. May. 



0. squamacea. Dew. Spike often an inch long, having many J* glumes at the 

 base and few perig. at the summit. — Longer than the other, and grows with 

 it in Ipswich, Mass., Oakes. 



B. Spikes several, androgynous. 

 1. Stamens vanmisly situated — above, beloio, or in the middle; sometimes dimcious. 



4. C. STERILIS. Willd. 



Spike compound, (^ below, often dicBcious; spikelets 4 — 6, ov.ate, subap- 

 proximate ; perig. ovate, acuminate or subrostrate, bifid, compressed, triquetrous, 

 scabrous on the" margin, equaling the ovate, acutish glume; st. 2f high, erect 

 and stiff. — Wet places, common. 



5. C. BROMolDEs. Schk. 



Spikelets numerous, alternate, (^ below, sometimes all 9 ; perig. lanceo- 

 late, erect, acuminate, scabrous, nerved, bifid, twice longer than the ovate- 

 lanceolate glume. — Common in small bogs, in wet places. 



6. C. siccATA. Dewey. 



Spikelets numerous, (j' above, often wholly ^, ovate, close or approximate ; 

 fr. ovate, lanceolate, acuminate, compressed, nerved, bifid, scabrous on the 

 margin, equaling the ovate and lanceolate glume. — Sandy plains, Westfield, 

 Mass., Davis; Ipswitch, Mass., Oakes; widely spread over the country, but not 

 abundant. 



7. C. Sartwellii. Dewey. 



Spikelets 12 — 20, ovate, sessile, compact, bracteate, lower ones especially 

 fructiferous; upper often ^f; perig. ovale, lanceolate, convexo-concave, subu- 

 late, short, 2-toolhed, a little longer than the ovate and acute glume; Ivs. flat, 

 linear, shorter than the stem. — Junius, Seneca Co., N. Y., SartweU. 



3, Stamens at the summit of the spikelets. 

 a> Cephalous, or fruit in heads. 



8. C. cephalofhora. Willd. 



Spikelets ovate, densely aggregated into an ovate head, bracteate, about 5 ; 

 perig. ovate,, acuminate, compressed, bifid, scabrous on the margin, with a short, 

 ovate, and scabro-cuspidate glume which equals it; st. 8 — 16' high. — Borders 

 of fields and woods, common, but not abundant. 



9. C. vui.piNOiDEA. Michx. (C. vu'pineeformis. Tiickerman. C. multi- 

 flora. Muhl.) — Spikelets ovate-oblong, obtuse; spike decompound, bracte- 

 ate, conglomerate; perig. ovate, acuminate, densely imbricate, bifid, tripli- 

 nerved, diverging, a little shorter than the ovate-cuspidate glume; st. obtusely 

 triangular, round and leafy towards the base.— Common in fields. 



/S.microsperma. Dew. (C. microsperma. Wahl.) Spikelets closely aggregated, 

 whole spike less compact; perig. more convex, shorter, less acuminated into a 

 beak, very abundant.— Gro^vs with the other, in dry and moist situations. 



10. C. SETACEA. Dewey. 



Spikelets ovate, alternate, obtuse, conglomerate, bracteate ; perig. ovate- 

 lanceolate, acuminate, compressed, bifid, some diverging, about equal to the 

 ovate-lanceolate, awned glume ; st. 2f high, acutely triangular, scabrous above 

 and striate. — Wet places — not abundant. 



11. C. MUHLENBERGIT. Schk. 



Spikelets alternate;, obtuse, approximate, with a lon^ bract at the lowei 



