SEDGE FAMILY 113 



Perigynia rounded at base» suborbicular in 

 cross-section, loosely enveloping achenes. 



32. Gll.\NUI^RES. 



Pistillate spikes elongate, linear to cylindric, 



slender peduncled. the lower drooping. 

 Culms strongly reddish tinged at base, aphyl- 



lopodic. 33. DEiiiLFis. 



Culms not strongly reddish tinged at baise. 



ohyllopodic. 

 .k( 



Spikes slender, few-flowerod; perigynia 4 

 mm. long or l&ss, not inflated, the beak 

 not becoming bidentate. 



34. Capillahes. 



Spikes dense, niany-flowored; perigynia 

 longer, more or less inflated, the beak 

 becoming bidentate. 



35. LONGTROSTKES. 



Scales dark-tinged. 36. Frigtdae. 



Lowest bract sheatliless. or sheathing; if sheatliing. perl- 



gj-nia strongly A)identate with stiff teeth. 

 Foliage pubescent; perig^-nia not bidentate. 



37. PaLLESCEXTKS. 



Foliage glabrous, or if rarely pubescent, perigj-nia bi- 

 dentate. 

 Perigynia rough-papillose. 38. An* >malae. 

 Perigynia at most granular-roughened. 



Perigynia beakless or very short-beaked; achenes 

 triangular. 



Perig>-nia glaucous. 39. Limosae. 

 Perigj-nia 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, 



perigj-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. 

 PerigjTiia little inflated ; lower bract 

 strongly sheathing. 



43. EXTENSAE. 



Perigynia little to much inflated; lower 

 bract not strongly sheathing. 

 Spike one. 44. PATTriFLORAE. 

 Spikes more than one. 



Perigynia finely and closely 

 ribbed. 



45. Psefdo-Cypereae. 

 Perigj-nia coarsely ribbed or 

 nerveless. 



46. puysocarpae. 



1. Nardtxae. 

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



2. INFI^\TAE. 



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



3. Athrochi-^exae. 

 Densely cespitose; leaf-blades involute, 1 mm. wide; staminate flowers few; perigj-nia 



erect until full maturity. . 3- F' Py^^^<^^^^\ 



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



perigj-nia early deflexed. 4. C. nigricans. 



4. Capitatae. 

 Represented by one species. 5- ^- capiiaia, 



5. DIOICAE. 



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



6. FOETIDAE. 



Leaf-blades 2-3.5 mm. wide; perig>Tiium little exceeding the scale at maturity. 



7. C. ternacula. 



Leaf-blades 1.5 mm. wide or less; perigynium much exceedmg the scale at nmturity. 

 Perigynia membranous, not stipitate. ». C. ?'f';p*^^^^^- . 



Perig>Tiia not membranous, stipitate. 9- ^- incurnjormxs, 



8 



