CVPERACBAE (skbGE IVVMlLYj 209 



Leaves equaliog or exceeding the cultns . . .51. C. -vu^nnoidea. 

 Leaves distinctly shorter thau the culms. 

 Purigynia lanceolate or lance-ovate . , .52. C. seiacea. 

 Perig-yuia broad-ovate to subovbicular . . (.'.2) C. seiacea, v. a7nj/i(/ua. 

 w. Perigynia drab to dark brown or purplish, plump, some- 

 what biconvex, 

 Perigynia obovoid, narrow-margined, .abruptly short- 

 beaked 53. C. decomposiia. 



I'erigynia ovoid, with rounded margins, tapering 

 gradually to a beak. 

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

 inliorescence light Drown, flexuous, loose, sub- 

 paniculate (54) G, diandra, v. ramosu. 



V. Perigynia prominently enlarged and spongy 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. {7. stipata. 



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



a disk-like base 57. (7. crus-corvi. 



tn. Rootstock slender and elongate ; culms mostly scattered, or if 

 tufted bearing slender stolons at base s. 

 s. Perigynia thin-margined ; heads elongate, 2-S cm, long, of 

 numerous distinct spikes. 

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

 laginous to cbartaceous, nerveless . , . 58. 0. arenaria. 

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

 formly ribbed, except at tbe orifice . . . . 59. C. SariwelUi 

 s. Perigynia plump, not thin-margined ; beads ovoid to glo- 

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

 Perigynia flat on the inner face, faintly nerved . . 60. O. stenophylhi. 

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

 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 

 Griseb. A. 



4.. Achenes lenticular or plano-convex; stigmas 2 (very rarely and 

 exceptionally 3) ; perigynia beakless or very short-beaked, with 

 entire or merely emarginate orifice £. 

 B. Perigynia dull Cf. 



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

 pistillate spikes all peduncled D. 



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



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

 spreading or drooping capillary peduncles ; old leaves 



revolute 63. ^. •ma/ritima. 



Awns shorter than the blades of the scales ; spikes strongly 



ascending ; old leaves involute .... 64. C. 8aUna,Y.cuspidaia. 

 2>. Scales spreading ; basal leafless sheaths fibrillose. 

 Leaf-sheaths glabrous. 

 Perigynia inflated, wrinkled in drying. 

 Spikes flexuous or drooping, the pistillate 8.5-10 cm. 



long 65. (7. criniia. 



Spikes suberect or spreading, 1-3.5 cm. long . , (65) 0. criniia, 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 spreading, 1-3.5 cm. long (65) C. crinita, v. simulana. 

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

 upper spikes mostly sessile S. 



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



F. Culms solitary or few ; lower shenths slightly if at all fibril- 

 lose G. 

 G. Perigynia nerveless R. 

 H. Perigynia plane, not twisted at tip /. 

 I. Culms leafy and tall, somewhat caespitose ; leaves 

 scabrous on the veins and margins ; basal ofi"- 

 shoots chiefly erect J. 

 J. Green, scarcely glaucous; pistillate spikes atten- 

 uate at tip ... . 64. O. salina, v. cuapidata, 

 J. Strongly glaucous ; pistillite spikes full and 

 rounded at tip. 

 Scales conspicuous, dark, nearly or quite equal- 

 ing the perigynia. 

 Scales blunt or acutish. 



Pistillate spikes 8-4.5 mm. thick , TiG. C. tiqnutUis. 



grat's manjjal — 14 



