CYPERACE^. 409 



Woods and meadows. Can. to Geor. W. to Mich. May. 1\-.—Culm 12—18 

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



Pubescent Sedge. 



40. C. virescens MM. : spikes ^^-i, 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. %. — 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. d^ Ton. 



Wet meadows. Mass. to Del. W. to Mich. June. %.. — 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. %. — Culm 12 — 18 inches 

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



Showy Sedge. 



43. C. Davisii Schw. <^ Torr. : spikes mostly 4, somewhat distant, ob- 

 long-cyUndric, 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 Torreijana Dew. 



Wet meadows. Mass. and N. Y. May. %..—Culm 1—2 feet high, trian- 

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



Davis's Sedge. 



E. Spikes several ; one ot^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. %. 

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



Rigid Sedge. 



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

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

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

 Lam. C. angustata Boott. 



Wet grounds. Can. to Car. W. to Ohio. May. %.-~Culm 2 feet high, 

 acutely triquetrous. Leaves subglaucous. Scales blackish brown. 



Large Bog Sedge. 

 18 



