Carex. 



CYPERACE^E. 



227 



entire : lower bracts exceeding the stem : sheaths not 

 fibrous-reticulate. 43. C. AQUATILLS. 



Male spikelets 1 to 3, the female 1 to 4, commonly male at top : 

 bracts seldom exceeding the stem : lower sheaths conspic- 

 uously fibrous-reticulate : perigynium nerveless or 1-4- 

 nerved, broader than the scale. 44. 



C. ANGUSTATA. 

 C. SENTA. 



C. LENTICULARIS. 

 C. SALINA. 



Lower sheaths scabrous, fibrous-reticulate : male spikelets 1 or 

 2 ; female 2 : bracts shorter than the stem : perigynium 

 ovate, toothed on the margins : upper scales mucronate. 45. 

 Male spikelets 1 or 2, often female at top : perigynium pale, broad- 

 ly oval, ending in a short cylindrical entire beak, biconvex, 

 stipitate, nerved : bracts longer than, the stem : scales 

 1 -3-nerved : sheaths entire. 46. 



Stem 2J to 5 inches high : bracts exceeding the stem, sheathed : 

 perigynium oval, nerved, the orifice entire : scales clasping, 

 broadly oval, obtuse or the female awned, 3-nerved. 47. 



Stem 1 to 4J feet high, stout : lower sheaths fibrous- reticulate : 

 male spikelets 1 to 4 ; female 3 to 5, 1 to 4 inches long : 

 perigynium purple, orbicular-obovoid, turgid, stipitate, co- 

 riaceous, nerveless : bracts far exceeding the stem. 

 Male spikelets 1 to 4 ; female 3 or 4 : perigynium oval or obovate, 

 abruptly ending in a bidentate beak with serrate teeth, 

 biconvex above, strongly nerved, resinously dotted : scales 

 acute or cuspidate : bracts about the length of the stem. 

 Male spikelets 1 or 2 ; female 3 or 4, remote : perigynium oval or 

 obovate, lenticular-compressed, sparingly toothed on the 

 upper margins, nearly entire or bidentate with serrate 

 teeth, punctate, more or less nerved : scales ciliate, acute 

 or awned : bracts far exceeding the stem. 



Spikes long-cylindrical ; male 1 or 2 ; female 4 to 8 : perigynium 

 ovate, rostellate, emarginate, nerved: scales purple, broadly 

 ovate, emarginate, 3-nerved, cuspidate : bracts uiuch longer 

 than the stem. 

 Stigmas 3. 



Perigynium beakless or short- beaked, the orifice entire or emarginate 



or bidentate. 

 Perigynium smooth. 



Stem obtusely angled : spikes oblong ; male 1 ; female 1 or 2, 

 rarely 3 : perigynium ovoid, obtusely angled, ending in a 

 short straight point, nerved, granular. 



Stem sharply angled : leaves and bracts broad : spikes cylin- 

 drical, 4 or 5 ; male 1 ; female loosely flowered : perigyn- 

 ium ellipsoidal, many-nerved, acute at each end, erect or 

 bent at the apex, the orifice hyaline and entire. 



Spikes 3 to 6, ellipsoidal or club-shaped ; male 1, rarely 2 ; the 

 lower female peduncled, pendulous : perigynium oval or 

 ovate, abruptly rostellate with entire or bidentate beak, 

 obscurely nerved. 



Spikes 3 to 6, oblong or obovoid ; male 1 : perigynium yellow- 

 ish, obovoid, ventricose, abruptly rostellate with purple 

 emarginate beak, nerved, divergent. 55. 



Spikes 3 or 4, oblong or club-shaped : perigynium elliptical, ros- 

 trate, bidentate, the spreading teeth serrate-toothed. 56. 

 Perigynium pubescent. 



Spikes 2 to 4 ; male 1 : perigynium obovoid, abruptly rostellate, 

 the orifice entire, nerveless : bracts purple, leafless, subu- 

 late : scales ciliate. 57. 



Spikes 4 to 6 ; the male 1; the lower female subradical : peri- 

 gynium globose, tapering to the base, coriaceous, abruptly 

 rostrate, nerved, bidentate : scales 1 - 3-nerved. 58. 



Spikes 3 or 4, loosely few-flowered ; male 1 ; lower female sub- 

 radical : perigynium coriaceous, hispid, triangular-subglo- 

 bose, tapering to the obscurely striate base, the beak 

 straight or bent, bidentate : scales clasping, 1 - 3-nerved. 59. C. BREVIPES. 



Hairy : spikes 2 to 4 ; male 1, often female at top ; female 

 cylindrical, loosely flowered, the lower remote on long 

 erect peduncles : perigynimn triangular-ellipsoidal, acute 

 at base, abruptly rostrate, beak bidentate. 60. C. HIRTISSIMA. 



48. C. SlTCHENSIS. 



49. C. JAMESII. 



50. C. LACINIATA. 



51. C. PRESCOTTIANA. 



52. C. LIVIDA. 



53. C. LAXIFLORA. 



54. C. PODOCARPA. 



C. KAYNOLDSII. 



C. SERRATODENS. 



C. RlCHARDSONI. 

 C. GLOBOSA. 



