CYPERACE^E. 409 



Woods and meadows. Can. to Geor. W. to Mich. May. Q.Culm 1218 

 inches high, triangular, rough, leafy. Leaves and sheaths retrorsely pubescent. 



Pubescent Sedge. 



40. C. virescens MM. : spikes 2 4, oblong, erect ; upper one peduncu- 

 late, sterile below ; the rest fertile, subsessile and bracteate ; perigynium 

 ovoid, obtuse, costate, pubescent, rather longer than the ovate mucronate 

 scale. C. costata Schw. 



Dry woods. Can. to Car. May. r l\-. Culm 1 2 feet high, rather slender, 

 triangular, leafy. Leaves and sheaths pale green, pubescent. 



Greenish Sedge. 



41. C. gracilima Schw.: spikes mostly 4, distant, slender, pedunculate, 

 loosely-flowered, nodding ; uppermost androgynous, fertile above ; the rest 

 all fertile ; peryginium oblong, triangular, obtuse, smooth, longer than the 

 oblong-mucronate scale. C. digitalis Schw. fy Torr. 



Wet meadows. Mass, to Del. W. to Mich. June. Q.Culm 18 inches high, 

 nearly smooth, leafy. Leaves short, pale green. Spikes linear and filiform. 



Slender-nodding Sedge. 



42. C.formosa Dew. : spikes 3 4, oblong, thick, distant, on exsert pe- 

 duncles, nodding, uppermost one sterile at the base ; perigynium oblong, 

 triquetrous, somewhat inflated, rather acute at each end, nearly entire or 

 2-lobed at the orifice, twice as long as the ovate acute scale. 



Wet meadows. Mass, and N. Y. ; rare. May. 1|_. Culm 12 18 inches 

 high, triangular, smooth. Leaves sometimes pubescent, pale green. 



Shovjy Sedge. 



43. C. Davis-ii Schw. fy Torr. : spikes mostly 4, somewhat distant, ob- 

 long-cylindric, few-flowered, pedunculate and somewhat nodding ; peri- 

 gynium oblong, somewhat inflated, acute, smooth, slightly 2-toothed, about 

 as long as the awned scale. C. aristata and Torreyana Dew. 



Wet meadows. Mass, and N. Y. May. 'H-.Culm 12 feet high, trian- 

 gular, leafy, rough above. Leaves sometimes pubescent, rough on the margin. 



Davis's Sedge. 



E. Spikes several ; one or more of the terminal ones entirely stami- 



nate ; the rest pistillate. 



* Stigmas 2. 



44. C. rigida Good. : sterile spike mostly solitary, erect ; fertile spikes 

 2 4, oblong-cylindric, subremote, erect, loose-flowered, on short peduncles ; 

 perigynium oval, acute at each end, compressed, shortly beaked, smooth, 

 about equalling the ovate-oblong acutish scale. C. Washingtoniana Dew. 

 C. nigra Schw. <$* Torr. 



Damp grounds. White Mountains, N. H. Mount Marcy, N. Y. July. 7|.. 

 Culm a foot high, subscabrous above. Leaves light green, somewhat rigid. 



Rigid Sedge. 



45. C. acuta Linn. : sterile spikes 1 3 ; fertile mostly 3, subpeduncu- 

 late, somewhat nodding, cylindric, remote ; perigynium oval or oblong, ob- 

 tuse, short-rostrate, about as long as the oblong acute scale. C. stricta 

 Lam. C. angustata Boott. 



Wet grounds. Can. to Car. W. to Ohio. May. r i\..Culm 2 feet high, 

 acutely triquetrous. Leaves subglaucous. Scales blackish brown. 



Large Bog Sedge. 

 18 



