SEDGE FAMILY 113 



Perigynia rounded at base, suborbicular in 

 cross-section, loosely enveloping achenes. 



32. GRANUI.ARES. 



Pistillate spikes elongate, linear to cylindric, 

 slender pediincled, the lower drooping. 

 Culms strongly reddish tinged at base, aphyl- 



lopodic. .33. Debiles. 



Culnis not strongly reddish tinged at base, 

 phyllopodic. 

 Spikes slender, few-flowered; perigynia 4 

 mm. long or less, not inflated, the beak 

 not becoming bidentate. 



34. Capill.\res. 

 Spikes dense, many-flowered: perigjTila 



longer, more or less inflated, the beak 

 becoming bidentate. 



35. LONGIROSTRES. 



Scales dark-tinged. 36. Frigid.\e. 



Lowest bract sheathless, or sheatliing; if sheathing, peri- 

 gj-nia strongly bidentate with stiff teeth. 

 Foliage pubescent; perigynia not bidentate. 



37. Pallescextes. 

 Foliage glabrous, or if rarely pubescent, perigynia bi- 

 dentate. 

 Perigynia rough-papillose. 38. Anom.\LAE. 

 Perigynia at most granular-roughened. 



Perigynia beakless or very short-beaked; achenes 

 triangular. 

 Perigynia glaucous. 39. LiMOSAE. 

 Perigynia not glaucous. 



40. Atratae. 

 Perigynia with strongly bidentate beak, or if not, 



achenes lenticular. 

 Achenes lenticular; perigynia dull. 



41. ACUTAE. 



Achenes triangular, or if rarely lenticular, 

 perigjTiia shining. 

 Perigj^nia coriaceous, little if at all inflated, 

 often pubescent; bracts sheathless. 



42. HiRTAE. 



Perigynia glabrous, often inflated: if rarely 

 coriaceous, the bracts sheatliing. 

 Perigynia little inflated; lower bract 

 strongly sheathing. 



43. EXTENSAE. 



Perigynia little to much inflated; lower 

 bract not strongly sheathing. 

 Spike one. 44. P.\uriFLOR.\E. 

 Spikes more than one. 



Perigynia finely and closely 

 ribbed. 



45. Pseudo-Cypereae. 

 Perigynia coarsely ribbed or 



nerveless. 



46. Physocarpae. 



1. n.ardinae. 

 Represented by one species in our range. 1. C. Hepburnii. 



2. Infi^^tae. 

 Represented by one species in our range. 2. C. Engelmannii. 



3. Athrochlaenae. 



Densely cespitose; leaf-blades involute, 1 mm. wide; staminate flowers few: perigynia 

 erect until full maturity. 3. C. pi/renaica. 



Short-stoloniferous ; leaf-blades flat, 1.5 mm. wide or more; staminate flowers con.spicuous ; 

 perigynia early deflexed. 4. C. nigricans. 



4. Capit.\tae. 

 Represented by one species. 5. C. capitata. 



5. DiOICAE. 



Represented by one species in our range. 6. C. gynocrates. 



6. FOETIDAE. 



Leaf-blades 2-3.5 mm. wide; perigj-nium little exceeding the scale at maturity. 



7. C. rernacula. 

 Leaf-blades 1.5 mm. wide or less; perigynium much exceeding the scale at maturity. 



Perigynia membranous, not stipitate. 8. C. perglobosa. 



Perigynia not membranous, stipitate. 9. C. incurviformis. 



8 



