SEDGE FAMILY 113 



Perigynia rounded at base, suborbicular in 

 cross-section, loosely enveloping achenes. 



32. GRAXULARES. 

 Pistillate spikes elongate, linear to cylindric 



slender peduncled, the lower drooping. 

 Culms strongly reddish tinged at base, aphvl- 



lopodic. 33. DEBILES. 



Culms 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. CAPILLARES. 

 Spikes dense, many-flowered; perigynia 



longer, more or less inflated, the beak 

 becoming bidentate. 



35. LOXGIROSTRES. 



Scales dark-tinged. 36. FRIGIDAE. 



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

 gynia 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. AXOMALAE. 

 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, 



perigynia shining. 



Perigynia coriaceous, little if at all inflated, 

 often pubescent; bracts sheathless. 



42. HlRTAE. 



Perigynia glabrous, often inflated; if rarely 



coriaceous, the bracts sheathing. 

 Perigynia little inflated; lower bract 

 strongly sheathing. 



43. EXTENSAE. 



Perigynia little to much inflated; lower 



bract not strongly sheathing. 

 Spike one. 44. PAUCIFLORAE. 

 Spikes more than one. 



Perigynia finely and closely 

 ribbed. 



45. PSEUDO-CYPEREAE. 

 Perigynia coarsely ribbed or 



nerveless. 



46. PHYSOCARPAE. 



1. XARDTXAE. 

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



2. INFLATAE. 

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



3. ATHROCHLAEXAE. 



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

 erect until full maturity. 3. C. pyrenaica. 



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

 perigynia early deflexed. 4. C. nigricans. 



4. CAPITATAE. 

 Represented by one species. 5. C. capitata. 



5. DIOICAE. 

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



6. FOETIDAE. 



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



7. C. ternacula. 

 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. incur i: if or mis. 



8 



