SEDGE FAMILY 113 



Perigynia rounded at base, suborbiciilar in 

 cross-section, loosely enveloping achenes. 

 32. Granulares. 

 Pistillate spikes elongate, linear to cylindric, 

 slender peduncled, the lower drooping. 

 Culms strongly reddish tinged at base, aphyl- 



lopodic. .33. Debiles. 



Culms not strongly reddish tinged at base, 

 phyllopodic. 

 Spikes slender, few-flowered; perigynia 4 

 mm. long or less, not inliated, the beak 

 not becomuig biilentate. 



34. Capillares. 

 Spikes dense, many-flowered; perigynia 



longer, more or less inflated, the beak 

 becoming bidentate. 



35. LONGIRO.STRES. 



Scales dark-tinged. 36. Frigidae. 



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

 gynia strongly bidentate with stiff teeth. 

 Foliage pubescent; perigynia not bidentate. 



37. Pallescentes. 

 Foliage glabrous, or if rarely pubescent, perigynia bi- 

 dentate. 

 Perigynia rough-papillose. 38. Anomalae. 

 Perigynia at most granular-roughened. 



Perigynia beakless or very short-beaked; achenes 

 triangular. 

 Perigynia glaucous. 39. Limosae. 

 Perigy-nia not glaucous. 



40. ATR.'VTAE. 



Perigynia with strongly bidentate beak, or if not, 

 achenes lenticular. 

 Achenes lenticular; perigynia dull. 



41. ACUTAE. 



Achenes triangular, or if rarely lenticular, 

 perigy^nia shining. 

 Perigynia coriaceous, little if at all inflated, 

 often pubescent; bracts sheathless. 



42. HiRTAE. 



Perigynia glabrous, often inflated; if rarely 

 coriaceous, the bracts sheathing. 

 Perigy^nia little inflated; lower bract 

 strongly sheathing. 



43. EXTENSAE. 



Perigynia little to much inflated; lower 

 bract not strongly sheathing. 

 Spike one. 44. PAuriFLORAE. 

 Spikes more than one. 



Perigynia finely and closely 

 ribbed. 



45. Pseudo-Cypereae. 

 Perigynia coarsely ribbed or 



nerveless. 



46. Physocarpae. 



1. X.\RDINAE. 



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



2. INFLATAE. 



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



3. Athrociilaenae. 

 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. Capitatae. 

 Represented by one species. 5. C. capitala. 



5. DiOICAE. 



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



6. FOETIDAE. 



Leaf-blades 2-3.5 mm. wide; perigyniuni little e.xceeding the scale at maturity. 



7. C. vernacula. 

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



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



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



