CYPKKACEAE (SEDGE FAMILY^i 207 



C. Perigynia ovate, 3-4 inin. long^. 

 Spikes at most l'2-llo\vered. 

 Inflorescence 1-3 cm. long, the 2—6 spikes subap- 



proxiniato . . . . . . . . 27. C. sUllulata. 



iDfloresceiice 2—6 cm. long, the 2-4 spikes very re- 

 mote, the terminal with a clavate base 0.5-1 



cm. long (27) C. siellulata, v. ormaniha. 



Spikes with more flowers. 

 Leaves 1-2.5 mm. broad; spikes scattered, 12—20- 

 flowered ; perigynia less than half as broad as 



long (27) C. siellulata, v. excehio?-. 



Leaves 2-4 mm. broad ; spikes mostly approximate, 

 15— 40-flowered ; perigj-nia half as broad as 

 long ....... (27) C. siellulata, v. cephalantha . 



e. Perigynia lanceolate or ovate-lanceolate, 2.5-3 mm. long ; 



inflorescence of 2-0 approximate spikes . (27) C. siellulata, v. angustata. 



d. Perigynia more than half as broad as long (narrower onlj- 

 in var. of no. 29), tirm, brownish or dark green; 

 beak one fourth to one half as long as the body. 

 Scales sharp-pointed ; leaves 2.5-4.5 mm. broad ; inflo- 

 rescence 1.5-3.5 cm. long; spikes 15-50-flowered ; 



coarse plant . 28. (7. sterilis. 



Scales blunt; leaves narrower; inflorescence 1-2 cm. 

 long ; spikes 5-15-flowered ; slender plants. 

 Leaves 1—2 mm. broad ; jierigynia faintly nerved or 

 nerveless on the inner face. 

 Perigynia deltoid-ovate, spreading .... 29. C. scirpoides. 

 Perigynia lance-subulate, ascending . . (29) C. scirpoides, v. Josselynii. 

 Leaves narrower; perigynia strongly nerved (29) C. scirpoides, v. capillocea. 

 O. Perigynia broadest near the middle, less than 2 mm. broad, 

 very thin and conspicuously nerved, with short smooth 

 beak ; sjnkes remote . " SO. 0. seorsa. 



B. PERIGTirrA NOT TUTX-WINGEU, ASCENDING FROM THE FIRST, PLANO- 

 CONVEX /. 



/. J.'erigynia 4 mm. or more long, long-beaked. 



Spikes lance-cyhndric, in a loose linear-cylindric inflorescence ; 

 perigvnia 1-1.3 mm. broad, strongly nerved; scales ob- 

 long; leaves 1-2.5 mm. broad . ' 34. C.hromoides. 



Spikes ovoid or ovoid-cylindric ; perigynia 1.6-1.9 mm. broad, 

 faintlv nerved or nerveless ; scales ovate ; leaves 2-5 mm. 



broad 35. C. Deweyana. 



f. Perigj'nia less than 4 mm. long g. 



g. Perigynia with serrulate beaks or margins h. 

 k. Inflorescence elongate, from slender to thickish-cylindric i. 

 i. Perigynia ovate, broadest at base ; spikes mostly or all 



approximate in a thick cylindric inflorescence . . 31. C. arctu. 

 i. Perigynia broadest near the middle. 



Plant glaucous : leaves 2-4 mm. broad ; spikes -svith 

 many appressed-ascending glaucous obscurely 

 beaked jierlgvpia. 

 Spikes 6-10 mm. long, approximate or the lowest 



rarely 1.5 cm. apart; perigynia 2.8-3 mm. long . 82, C canescens. 

 Spikes 4^7 mm. long, subapproxiuiate or remote; 



perigynia about 2 mm. long . . . (32) C. caneseens, v. suN-oUacea. 

 Spikes ^12 mm. long, remote, the lowest 2-4 cm. 



apart (32) C. canesceiis, v. disjuncta. 



Plant green, not glaucous; leaves 1-2.5 mm. broad; 

 spikes with few loosely spreading dark green or 



brown distinctly beaked perigynia . . . . 33. f. 7>runnescenJt. 

 h. Inflorescence subglobose, of 2-4 closely approximate sub- 

 globose looselv flowered silverv spikes ; perigynia 

 oblong, beakless, nerved, 3-3.4 aim. long . . " . 36. C. tenuijlora. 

 q. Perigv-nia smooth throughout j. 



}. Spikes whitish, silverv green or pale brown. 



Inflorescence elongate, at least the lower spikes scattered. 

 Uppermost spikes divaricate-pedunculate, lowermost 

 subtended by a leaf-like bract ; perigynia usually 

 more than 3 mm. long. 



Leaves flat, 1-2 mm. broad 37. (7. irispenna. 



Leaves setaceous, 0.3-0.5 mm. broad . . (37) C. trispei'ma, v. BiUingidi 

 Spikes continuous in a linear-cylindric loose inflores- 

 cence, brnctless or onlv short-bracted ; perigynia 



2-3 mm. loiiir . " . 32. T. eanescens. 



Inflorescence subglobose, of 2-4 closely approximate sub- 

 globose loosely flowered sjiikes ; perigynia beakless, 



3 mm. or more long 36. C. tenuijlora. 



j. Spikes ferruginous or dark brown : terminal spikes with 

 conspicuous clavate base; i)eri;;yi;ia abruptly beaked; 

 culms smooth (or harsh only at tips). 



