CYPEUACEAE (SEDGE FAMILY) 209 



Leaves equaling or exceedingr the culms . . . 51. C vulpinoidea. 

 Leaves distinctly sli«>i-ter than the culms. 

 Perigynia lanceolate or lance-ovate . . .52. C. aetacea. 

 Peiif,'ynia broad-ovate to suborbicular . . (r)2) C. aetacea, v. amhigua. 

 ID. Perigyiiia drab to dark brown or purplish, plump, some- 

 what biconvex. 

 Perigynia obovoid, narrow-margined, abruptly short- 

 beaked 53. (7. decomposiia. 



Perigynia ovoid, with rounded margins, tapering 

 gradually to a beak. 

 Inflorescence dark brown, stiff, dense, spiciform . 54. C. diandra. 

 Inflorescence light browii, flexuons, loose, sub- 

 paniculate (54) C. diandra, v. ramosa. 



v. Perigynia prominently enlarged and spcngy at base, con- 

 spicuously nerved, the slender beak much longer than 

 the body. 

 Perigynia* 4-5 mm. long, tapering gradually from base 



to tip 56. C. stipata, 



Perigvnia 6-9 mm. long, abruptly enlarged below into 



-a "disk-like base 57. (7. cru8-corvi, 



m. Eootstock slender and elongate ; culms mostly scattered, or if 

 tufted bearing slender stolons at base z. 

 s. Pwigynia thin-margined : heads elongate, 2-S cm. long, of 

 numerous distinct spikes. 

 Perigynia wing-margined ; inner side of leaf-sheath carti- 

 laginous to chartaceous, nerveless .... 58. C. arenaria. 

 Perigynia not Aving-margined ; leaf-sheath green and uni- 

 formly ribbed, excei)t at the orifice . . . . 59. C. Sartwellii. 

 z. Perigynia plump, not thin-margined : heads ovoid to glo- 

 bose, 0.5-1.5 cm. long, of few congested spikes. 

 Perigynia flat on the inner face, faintly nerved . . 60. C. sienophylla. 



Perigynia plano-convex, strongly nerved . . .61. C. cJiordorrhiza. 



I. Spike solitary, terminal, globular or short-ovoid . . . .62. C. capitata. 



§ 2. Some of the spikes strictly pistillate ; stigmas 3 and achenes trigonous ; or, 

 if stigmas 2 and achenes lenticular, some of the spikes peduncled. EUCAREX 

 Griseh. A. 



A. Achenes lenticular or plano-convex : stigmas 2 (very rarely and 

 exceptionally y) ; perigynia beakless or very short-beaked, with 

 entire or merely emarginate orifice £. 

 B. Perigynia dull C. 



C, Scales aristate or subulate-tipped, much exceeding the perigynia ; 

 I)istillate spikes all peduncled D. 

 D. Scales appressed-ascending ; basal sheaths rarely fibrillose. 



Awns longer than the blades of the scales ; sjiikes on wide- 

 spreading or droopnng capillary peduncles ; old leaves 



revolute 63. <7. maritima. 



Awns shorter than the blades of the scales ; spikes strongly 



ascending ; old leaves involute . . . . 64. C. salina, v. cuspidata. 



D. Scales spreading ; basal leafless sheaths fibrillose. 



Leaf-sheaths glabrous. 



Perigynia inflated, wrinkled in drying. 

 Spikes flexuous or drooping, the pistillate 3.5-10 cm, 



long 65. C. crinita. 



Spikes suberect or spreading, 1-3.5 cm. long . . (65) C. crinita, v. minor. 



Perigynia tight, not inflated (65) C. crinita v. Porteri. 



Leaf-sheaths scabrous-hispid. 

 Pistillate spikes 2.5-10 cm. long, drooping . . (65) C. crinita, v. gynandra. 

 Pistillate spikes suberect or sjireading. 1-3.5 cm. long (65) C. crinita, v. simulans. 

 C. Scales obtuse or acute, not aristate ; if subulate-tipped with the 

 upper spikes mostly sessile E. 



E. Perigynia compressed, lenticular or plano-convex F. 



F. Culms solitary or few ; lower sheaths slightly if at aU fibril- 

 lose G. 

 G. Perigynia nerveless H. 

 H. Perigynia plane, not twisted at tip /. 

 /. Culms leafy and tall, somewhat caespitose ; leaves 

 scabrous on the veins and margins ; basal oflF- 

 shoots chiefly erect J. 

 J. Green, scarcely glaucous ; pistillate spikes atten- 

 uate at tip 64. C. salina, V. ctispidata. 



J. Strongly glaucous ; pistill-ate spikes full and 

 rounded at tip. 

 Scales conspicuous, dark, nearly or quite equal- 

 ing the perigynia. 

 Scales blunt or acutish. 



Pistillate sjiikes 3-4.5 mm. thick . . <'>6. C. aqtiatilis. 



gray's MANl at, — 14 



