CYPERACEiE. 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. 

 AcJienium white, rough with elevated points. Few-flowered Nut Ru^h. 



** Perigynium none. 



5. S. verticillata Miihl. : culm filiform, triangular and with the leaves 

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

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

 rum xcrticillalwni Nees. 



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

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

 if whoi-led. Scales purple. Whorled Nut Rusk. 



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

 cate on all sides. Achenium entirely enclosed in an urceolate perigy- 

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



17. CAREX. I.m?i.— Sedge. 



(Supposed to be derived from the Greek Ksipo), to shear or cut ; in allusion to 

 its sharp leaves and stems.) 



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

 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. 

 * Monacious. Stigmas 2. 



1. C. capitata 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 White Mountains, N. H. Dr. Robbins. — Culm trian- 

 gular. Leaves filiform. • Capitate Sedge. 



** Dioecious. 

 t 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 6 — 8 inches high, 

 filiform. Leaves setaceous. Scales ovate. - Dioecious Sedge. 



■f Stigmas 3. 



3. C. scirpoidea Mich.: spike oblong-cyUndric, somewhat a<?ute; peri 

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

 what acute scairious scale. 



