CYPERACR/F.. 403 



Low meadows. N. H. to Car. - W. to Ohio. June. ^.Culm 9 18 inches 

 high, roughish above. Fascicles 2 3 ; 2 lateral ones on long slender peduncles. 

 Achenium white, rough with elevated points. Few-flowered Nut Rush. 



** Perigynium none. 



5. S. vcrlicillata Muhl. : culm filiform, triangular and with the leaves 

 smooth ; fascicles 4 6, alternate, sessile, distant; bracts minute, setaceous; 

 scales smooth ; achenium globose, mucronate, rugose- verrucose. Hypopo- 

 rum verticillalum Nees. 



Wet grounds. N. Y. to Car. Aug. 1J-. Culm 6 12 inches high, very 

 slender. Leaves very narrow, shorter than the culm. Fascicles appearing as 

 if whorled. Scales purple. Whorled Nut Rush. 



VIII. CARICEJE. Flowers diclinous. Scales of the spikes imbri- 

 cate on all sides. Achenium entirely enclosed in an urceolate 

 which is often 2-toothed or 2-lobed at the orifice. 



17. CAREX. Linn. Sedge. 



(Supposed to be derived from the Greek Kcipw, to shear or cut ; in allusion tc 

 its sharp leaves and stems.) 



Spikes one or several, androgynous, monoecious or rarely dio3- 

 cious. STERILE FL. Stamens 3, rarely 2 or 1. FERFILE FL. 

 Perigynium membranaceous or somewhat coriaceous, 2-toothed, 

 emarginate or truncate at the apex. Style single, included. 

 Stigmas 2 3, elongated, exserted. Achenium lenticular, plano- 

 convex or triangular, crowned with the lower portion of the 

 style. (Torr.) 



A. Spike single. 

 * Monoecious. Stigmas 2. 



1. C. capiiata Linn. : spike capitate or nearly globose, staminate at the 

 summit ; perigynium roundish-ovoid, close, compressed, convex-concave, 

 smooth, longer than the ovate and somewhat obtuse scale. 



Alpine regions of the Wliite Mountains, N. H. Dr. Robbins. Culm trian- 

 gular. Leaves filiform. Capitate Sedge. 



** Dioecious. 



j- Stigmas 2. 



2. C. dioica Linn. : spike simple, oblong ; perigynium somewhat erect 

 or spreading, oblong-ovoid, nerved, hispid toward the summit on the mar- 

 gin. C. Davalliana Dew. 



Swamps. Yates county, N. Y. Dr. Sartwell %.Culm 68 inches high, 

 filiform. Leaves setaceous. Scales ovate. Dioecious Sedge. 



t Stigmas 3. 



3. C. scirpoidca Mich.: spike oblong-cylindric, somewhat acute; peri 

 gynium ovoid or oval, subrostrate, pubescent, longer than the ovate some- 

 what acute scarious scale. 



