214 



CYPERAOEAE (SEDGE FAMILY) 



lOT. C. polymorpha. 

 108. C. vaginata. 



. 147. C.venu8ta,v. minor. 



122. C. Careyana. 



123. C. platt/phylla. 



i. Perigyniagranulose-roughened ; spikes very remote, ses- 

 sile or short-s talked, in nearly all the leaf-axils . 136. O. Crawei* 

 i. Perigynja not granulosa ; spikes (except in rare cases 

 long-stalked basal ones) borne only toward the sum- 

 mit of the culm J. 

 J, Leaves white-glaucous, quickly becoming plicate or 



involute Ill*- O. Uvida, 



J. Leaves green, slightly if at all glaucous, flat, in age be- 

 coming revolute. 

 Culms obtusely angled, smooth throughout . . 105. C. panicea. 

 Culms acutely angled, scabrous at summit. 

 Spikes slender-cyiindric, 3.6 mm. thick. 

 Spikes mostly close-tlowered, the perigynia over- 

 lapping ' 106. C. tetanica. 



Spikes loosely flowered, most of the perigynia 



remote . (106) C. letanica, v. Woodii. 



Spikes oblong-cylindric, G-lOmm. thick . . (106) C. teiuitica, v. Meadii. 

 h. Perigynia with a straightish slender beak. 



Culm stiff', harsh above ; spikes stiffly erect, densely many- 

 flowered .... 



Culm flexuous, smootli tliroughout ; spikes spreading or 



drooping, loosely few-flowered 



I. Perigynia with numerous uniform nerves from base to orifice (ex- 

 treme specimens of nos. 106, 1 07, 108 might be sought here) k. 

 k Tall and slender, with, linear-cylindric spikes 

 h. Low, or if tall with thick-cylindric to globose spikes I. 



I. Perigynia sharply angled, with plane faces (forms of C. laxl- 



flora might be sought here) tntt. 

 tn. Perigynia 6-7 mm. long ; staminate spikes dark brown or 



purplish 



ni. Perigynia 2-4 mm. long; staminate spike straw-color or 

 pale brown »i. 

 ». Basal leaves 1-3 cm. broad ; pistillate spikes sessile and 



erect 



n. Basal leaves narrower, or, if rarely 1 cm. broad, the spikes 

 flexuous on capillary peduncles. 

 Scales acuminate or aristate ; lowest bract slightly if at 

 all overtopping the inflorescence. 

 Basal leaves 6-12 mm. broad. 



Perigynia 2. S-3.y mm. long 124. C. lace^loulmis. 



Perigynia 3.8-4 mm. long .... (124) C. laxieuhnis, v. copulata. 



Basal leaves 2-5 mm. broad ...... 125. O. digitalis. 



Scales blunt ; lowest bract greatly overtopping the in- 

 florescence 126. 0. ptychocarpa. 



I. Perigyniaobtusely angled, orplumpandscarcelyifatallangled o. 

 o. Perigynia strongly ascending, beakless or with broadly 

 conic oblique tips ; spikes mostly scattered ; bracts 

 strongly ascending p. 

 p. Perigynia fusiform to fusiform-obovoid, tapering sub- 

 equally to the conic tip and the long gradually con- 

 tracted base, obtusely trigonous q. 

 q. Perigyniabeai'ingdistinct elevated ribs; scales smooth r. 

 r. Perigynia with several ribs on each face s. 



s. Staminate spike prominent, usually projecting 

 above the pistillate ; culms slightly if at aU 

 ancipital t. 

 t. Pistillate spikes distinct, not closely crowded. 

 Perigynia plurap-obovoid, the short beak ab- 

 ruptly bent to one side. 

 Pistillate spikes mostly 1.5-3 era. long . . 127. O. lax^^ora. 

 Pistillate spikes mostly 0.5-1.3 cm. long 



(127) C. lacD^ra, v. groGillima 

 Perigynia ellipsoid-fusiform, the elongate beak 

 slightly oblique. 

 Perigynia oppressed-ascending in an alter- 

 nate-flowered spike . . . (127) C. la^irflora, v . patvXifolia. 

 Perigynia oblique or divergent, mostly over- 

 lapping in tlie densish spike. 

 Basal leaves 7-12 mm. broad . (127) C. la^ifiora^ v. Michavanii. 

 Basal leaves 8-6 mm. vrlde . , (127) O. laixifiora, v. styloflexa. 



t. Uppermost pistillate spikes approximate at the 



base of the staminate .... (127) 0. laxijlora, \ . varians. 

 9 . Staminate spike small and nearly or quite hidden 

 among the pistillate ; culms ancipital. 

 Basal leaves elongate, linear-lanceolate, 5-14 mm. 



broad (127) C. laxifiora, v. blanda. 



Basal leaves lanceolate, 1.5-4 cm. broad . ^127) C. lascijlora, v. laUfolia. 

 *>. Perigynia nerveless or with 1-3 nerves on each face 



(127) 0. laxifivra, v. Jeptonerrin 



