Carex. CLX. CYPERACEiE. 577 



A. Spike sijigle. 2. DlcEcious. 



2. C. Davalliana. Smith. 



Spike oblong, ratlifr loosi'-flowcrccl ; pcrisr- ovate-lanceolate, attetiuate, 

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

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



3. C. Kxii-is. Dewey, 



Fertile spiLf (^ below, ovate, rather densely-flowered ; pcrig. ovate-lanceo- 

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

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

 vers and Ipswitch, Ms., Oa/iCs, in N. Y. and N. J. May, 



$. squamnaa. Dew. Spike olten an inch long, having many J* glumes at the 

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

 it in Ipswich, Mass., Onkcs. 



B. Spikes several, aiulrogyiwus. 

 1. Stamens rariovsly situated — above^ below , or in the middle ; sometimes dioEcious. 



4. C. STERILIS. Willd. 



Spike compound, J' below, often dioecious ; spikdets 4 — G, ovate, subap- 

 proximate ; pcrig. ovafts, acuminate or subrostrate, bifid, compressed, triquetrous, 

 scabrous on the margin, equaling the ovate, acutish glume; st. 21' high, erect 

 and stiff. — Wet places, common, 



5. C. EuoMoiDEs. Schk. 



Spikclcts numerous, alternate, J^ below, sometimes all 9 ; jjerig. 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. 



Spikelcts numerous, J^ above, often wholly J^, ovate, close or approximate ; 

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

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

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

 abundant. 



7. C. Sartwellii. Dewey. 



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

 fructiferous ; upper often J* ; perig. ovate, lanceolate, convexo-concave, subu- 

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

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



J8. Stamens at the summit of the spikelets. 

 a» Cephal<ms, or. fruit in heads. 



8. C. cephalophora. Willd. 



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

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

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

 of fields and woods, common, but not abundant. 



9. C. vri.piNOiDEA. Michx. (C. vulpinaelbrmis. Tuckerman. C. multi- 

 flora. Muhl.) — Spikelets o/ate-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. 



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

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

 beak, very abundant. — Grows with the other, in dry and moi.st situations. 



10. C. setacea. Dewey. 



Spikelets ovate, alternate, obtuse, conglomerate, bracteate; jpmo-. 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. MUHLENBERGII. Schk. 



Spikelets alternate, obtuse, approximate, with a long bract at the lower 



