214 



CYPEKACEAE (sEDGE FAMILY) 



%. 



i. 



J 

 J 



h. 



Peri?ynia granulose-roiig-hened ; spikes very remote, ses- 

 sile or sliort-stalked, in nearly all the leaf-axils . 

 Perigynia not granulose ; spikes (except in rare cases 

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

 mit of the culm j. 

 Leaves white-glaucous, quickly becoming plicate or 



involute 



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

 coming revolute. 

 Culms obtusely angled, smooth throughout 

 Culms acutely angled, scabrous at summit. 

 Spikes slender-cylindric, 3.6 mm. thick. 



Spikes mostly cluse-llowered, the perigynia over- 

 lapping 



Spikes loosely flowered, most of the j)erigynia 



remote (100) 



Spikes oblong-cylindric, G-10 mm. thick . . (100) 

 Perigynia with a straightish slender beak. 

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

 flowered 



Culm flexuous, smooth throughout ; spikes spreading or 



droojiing, loosely few-flowered 



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

 treme specimens of nos. loO, 107, 108 might be sought here) h. 

 h. Tall and slender, with hnear-cylindric spikes .... 

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



I. Perigynia sharply angled, with |(lane faces (forms of C. laxi- 

 jiora might "be sought here) m. 

 Perigynia 5-7 mm. long ; staminate spikes dark brown or 



purplish 



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

 pale brown n. 

 Basal leaves 1-8 cm. broad ; pistillate spikes sessile and 



erect ... 



Basal leaves narrower, or, if rarely 1 cm. 6road, the spikes 

 flexuous on capillary peduncles. 

 Scales acuminate or aristate ; lowest bract slightly if at 

 all overtop[)ing the inflorescence. 

 Basal leaves (j-l'i mm. broad. 

 Perigynia '2. S-;j. 2 mm. long 124, 



136. C. Orawei. 



104. C. livida. 



105. C. panicea. 



106. C. tetanica. 



< '. letanica, v. Woodii. 

 C. i eta idea, v. Meadii. 



107. 



108. 



C. polymorpha. 

 C. vayinata. 



m. 



m. 



n. 



n. 



147. C. venuaia, v. minor. 



122. C. Carey ana. 



123. C. platyphylla. 



Perigvnia 3.3-4 mm. long 



C. laxiciilmis. 



(124) C. laxiculmis, v. copulata. 

 . 125. C. digitalis. 



C. ptychocarpa. 



Basal leaves 2-5 mm. broad . 

 Scales blunt; lowest bi-act greatly overtopping the in- 

 florescence 126. 



I. Perigynia obtusely angled, or plump and scarcely if at all angled 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- 

 eqiially to ttie conic tip and the long gradually con- 

 tracted base, obtusely trigonous q. 

 q. Perigynia bearing distinct elevated ribs ; scales smooth r. 

 T. Perigynia with several ribs on each face s. 



S. Staminate s])ike prominent, usually projecting 

 above the pistillate ; culms slightly if at all 

 ancipital *. 

 t. Pistillate spikes distinct, not closely crowded. 



Perigynia j)himp-obovoid, the short beak ab- 

 ruptly txuit to one side. 

 Pistillate spikes mostly 1.5-3 cm. long . 

 Pistillate spikes mostly 0.5-1.3 cm. long 



(127) C. laxiflora, v. gracillima. 

 Perigynia ellipsoid-fusiform, the elongate beak 

 slightly oblique. 

 Perigynia appressed-ascending in an alter- 

 nate-flowered spike . . . (127) C. laxiflora, v. patulifolia. 

 Perigynia oblique or divergent, mostly over- 

 lapping in the densish spike. 

 Ba.sal leaves 7-12 min. broad . (127) C. laxiflora, v. Miehauxii. 

 Basal leaves 3-0 mm. wide . . (127) C. Laxiflora, v. styloflexa. 



t. Uppermost pistillate s[)ikes approximate at the 



base of the stamiiuvte .... (127) O. laxiflora, v. varians. 

 S. Staminate spike small and nearly or quite hidden 

 among the pistillate ; culms ancipital. 

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



broad (127) <7. laxiflora, v. bland a. 



Basal leaves lanceolate, 1.5-4 cm. broad . (127) C. laxiflora. v. laiifolia. 

 CT". Perigynia nerveless or with 1-3 nerves on each face 



C127) 0. laxiflora, v. leptonerrin 



127. O. laxiflora. 



