CTPERACEJE. 



413 



spikelefs, rarely dioecious; glumes single, l-flowered, lower 

 ones often empty; stamens 3; stigmas 2 or 3 ; perigynium 

 of various forms, 1-valved, persistent, enclosing the ieniicular 

 or triangular achenium. 



I. STIGMAS TWO. ACHKMUM DOUBLE CONVEX. 



A. Spike single. 1. Mokceciouc-. 



1. C. CAPITATA. L. 



Spike capitate or nearly globose, staminate at the summit; Jrv.it (perigyni- 

 um) roundish-ovate, close, compressed, convex-concave, gliibrous, acutish, 

 longer than the ovate and rather obtuse glume ; [eaves slender. Alpine 

 regions of the White Mts. Robbins. 



A. Spike single. 2. DicECioua. 



2. C. Davai.liana. Smith. 



Spi/;e oblong, rather loose flowered ; jyerigynium ovate-lanceolate, attenu- 

 ate, convex, terete, recurved, longer than the ovate glume ; stern and leaves 

 are usually serrulate. Wayne Co., N. Y. SuriwtU. 



3. C. exi'lis. DeiBcy. 



Fertile apike staminate below, ovate, rather densely flowered; pcrig. ovate- 

 lanceolate, convex on botJi sides, diverging, serrulate on the margin, a little 

 longer than the ovate, acute glume ; leaves setaceous; sfem \2 — 2U inches 

 high. Grows in Danversand [pswich, Ms. — 0(//i:es; in N. Y andiN.J. May. 



p. squamncca (D.) ; spike often an inch long, having many staminate glumes 

 at the base and few /jer*^'". at the summit ; longer than the other, and grows 

 with it in Ipswich, Mass. Oakes. 



B, Spikes several, androgynous. 



J • Stamens variously situated — aSoi-c, helow-i or in tlu middle ; sometimes diacious. 



4. C. ste'kilis. WiUd. 



Spike compound, staminate below, often dicecious; spikelefs 4 — 6, ovate, 

 subapproxiinate ; perig. ovate, acuminate, or subrostrate, bifid, compressed, 

 triquetrous, scabrous on the margin, equaling the ovate, acutish glume; slcTn 

 2 feet high, erect and stiff'. Wet places ; common. 



5. C. BROMoiDEs. Sclik. 



Spikclets numerous, alternate, staminate below, sometimes all pistillate ; 

 perig. lanceolate, erect, acuminate, scabrous, nerved, bifid, twice longer than 

 the ovate-lanceolate glume. Common in small bogs, in wet places. 



6. C. siccATA. Deiccy. 



Spikelefs numerous, staminate above, often wholly staminate, ovate, close 

 or approximate; fruit ovate, lanceolate, acuminate, compressed, nerved, bifid, 

 scabrous on the margin, equaling the ovale and lanceolate glume. Sandy 

 plains, VVestfield, Mass. D^ivis ; Ipswich, Mass. Ocikcs ; widely spread over 

 the country, but not abundant. 



7. C. Sartwellii. Dewey. 



Spi.kdr.fs 12 — 20, ovate, sessile, compact, bracteate, lower ones especially 

 fructiferous ; upper often staminate ; perig. ovate, hsnceolate, convexo-con- 

 cave, subulate, siiort, 2-tootiied, a little longer than the ovate and acute glume ; 

 leaves flat, linear, shorter than the stem. Junius, Seneca Co., N. Y . Sarticell. 



2. Stamens ot the summit of the spikelets. 

 a. Ceplialous, or fruil in heads. 



8. C. CEPHALO'PHORA. IVilld. 



Spikelets ovate, denselv agorregated 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; .''tevi 8 — 16 inches 

 high. Borders of fields and woods; common, but not abundant. 



