210 



CYPERACEAE (sEDGE FAMILY) 



(66) C atjuatiliH, v. elatior 

 (66) C. iKjuatiliH, v. cuHpidatn. 

 . (<iC) C. aqudtilis, v. virescens. 

 basal ofT- 



(J. rig id a. 

 C. torta. 



67. 

 68. 



C. lenticularis. 

 C. Goodenowii. 



71. C. stricta. 

 C. dtficia, V. curtissima. 



C. stricta, v. anguxtdid. 



C. stricta, V. decora. 



Pistillate spikes 5-S mm. thick 

 Scales cuspidate .... 

 Scales hidden by the perigynia 

 /. Culms low ; leaves mostly basal, smooth 

 shoots chiefly repent .... 

 ff. Perigynia elongate, with an empty twisted tip 

 G' Perigynia nerved. 



Caespitose, not stoloniferous ; green central portion 



of the scale about as broad as the darker margins . 69. 

 Stoloniferous ; green midrib of the purple or blackish 



scale very slender 70. 



F. Culms numerous in stools ; lower sheaths fibrillose. 



Perigynia elliptic, tapering about equally to base and apex. 

 Pistillate spikes dense, mostly full at base ; scales blunt, 

 slightly if at all exceeding the perigynia. 



Pistillate spikes 2-7 cm. long 



Pistillate spikes ((..5-1.5 cm. long . . . . (71) 

 Pistillate spikes rather loose, long-attenuate at base ; 



scales acutish (71) 



Perigynia obovate or orbicular, shorter than the attenuate 



scales . (71) 



F. Perigynia plump, subterete. 



Mature perigynia fleshy, pyriform or subglobose, orange or 



brownish, glabrous" . " 72. C. aurea. 



Mature perigynia not fleshy, ellipsoid, slender-stipitate, 



white, pulverulent 73. C. hicolor. 



B. Perigynia lustrous. 

 Perigynia nerved. 



Leaves flat ; bracts ascending ....... 



Leaves soon involute ; bracts divergent 



Perigynia nerveless. 



Leaves flat ; pistillate spikes subglobose or short-cylindric, 



5-8 mm. thick 



Leaves involute or filiform ; pistillate spikes slender, 3-7 mm. 



thick (179) 



A . Achenes trigonous ; stigmas 3 (very rarely and exceptionally 2) £. 

 K. Spikes solitary, terminal L, 

 L. Spikes naked or without large leafy bracts M. 



M. Leaves tongue-shaped, 2—4 cm. broad 



M. Leaves grass-like, narrow N. 

 N. Spikes monoecious, green or straw-color; perigynia gla- 

 brous 0. 

 0. Spikes staminate at tip, few-flowered ; perigynia with entire 

 tips. 

 Perigynia appressed-ascending, in a linear-cylindric 

 spike, beakless. 

 Perigynia 2.5-3.5 mm. long ; achenes lustrous, not 

 puncticulate, obtusely trigonous .... 

 Perigynia 4-5 mm. long ; achenes puncticulate, barely 

 lustrous, sharfdy trigonous . 

 Perigynia soon refi-acted, slender-beaked 

 O. Spikes staminate at base, many-flowered ; perigynia with 

 long bidentate beaks. 

 Scales of pistillate flowers subulate-tipped 



Scales blunt 



K. Spikes dioecious, purplish-brown ; j)erigynia pubescent. 



Culms shorter than the leaves ; scales' short-aristate, ex 



ceeding the perigynia 



Culms exceeding the" leaves ; scales blunt, shorter than 



the perigynia 



L. Spikes subtended by long leafy bracts. 

 Perigynia somewhat 2-edged. 

 Scales all bracteate, overtopping the perigynia . . .89. C. 

 Only the lowest scales overtopping the perigynia . . 90. C. 

 Perigynia globose, with slender cylindric beak . . .91. C. 



K. SpIKKS 2 OR MORE /*. 



P. Perigynia not rigidly hidenfate. the orifice entire or emar 

 ginate, the teeth if jirei^ent soft and thin Q. 

 Q. Terminal spike bearing some pistillate flowers It. 



R. Terminal spike pistillate throughout, brown or purplish, the 



lower spike much smaller ; jicrigynia hairy . 

 R. Terminal spike with both staminate and pistillate flowers *S'. 

 S. Terminal sjiike pistillate only at base ; the capillary pedun- 

 cles often basal : perigynia sharjily anirlod . 

 S. Terminal spike pistillate at summit, or, if pistillate at base, 

 the spikes mostly near the tip of the culm T. 

 T. Perigynia ascending U. 

 U. Scales brown to purplish-black ; spikes globose, ovoid 

 or thick-cylindric V. 



75. C. leptalea. 



76. 

 74. 



161. 

 162. 



116. 

 92. 



C. Uarperi. 

 C. paucifiora. 



C. sguarrosa. 

 C. typhinoidea. 



C. picta. 



C. scirpoidea. 



Backii. 



WilMenowiic 



Jarneaii. 



92 C. scirpoidea. 



118. C. peduncuUita. 



