CYPEUACEAE (SEDGE FAMILY") 



207 



fl. Perigynia ovate, 8-4 mm. long. 

 Spikes at raosd; 12-flowered. 

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



proximate . 27. C. stelltdata. 



Inflorescence 2-6 cm. long", the 2-4 spikes very re- 

 mote, the terminal with a clavate base (J. 5-1 



cm. long (27) C. aiellulata, v. ormantha. 



Bpikes with more flowers. 

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

 flowered ; perigynia less than half as broad as 



long „ (27) G. ateHulaia, v. excelsior. 



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

 l&-40-flowered ; perigynia half as broad as 



long (27) 0. stellulaia, v. cephalantha. 



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



inflorescence of 2-6 approximate spikes . (27) O. sieUuIaia, v. angusiaia 



d. Perigynia more than half as broad as long (narrower only 

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

 beak one fom-th 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. C. sterilia. 



Scales blunt; leaves narrower; Inflorescence 1t2 cm. 

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

 Leaves 1-2 mm. broad ; perigynia faintly nerved or 

 nerveless on the inner face. 

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

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

 Leaves narrower; perigynia strongly nerved (29) C. eeirpoides, v. cavillacea. 

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

 very thin and conspicuously nerved, with short smooth 



beak ; spikes remote 80. C. seoraa. 



?. Perigynia not thin-winged, ascending from the first, plano- 

 convex /. 

 /. >.'erigynia4 mm. or more long, long-beaked. 



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



{)erigynia 1-1.3 mm. broad, strongly nerved; scales ob- 

 ong; leaves 1-2.5 mm. broad 84. C.hromoidea. 



Spikes ovoid or ovoid -cylindric ; perigynia 1.6—1,9 mm. broad, 

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

 broad .... . .... 85. C. Deweyana. 



f. Perigynia less than 4 mm. long g. 



g. Perigynia with serrulate beaks or margins h. 

 k. Iniiorescence elongate, from slender to thickish -cylindric *. 

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



approximate in a thick cylindric inflorescence . . 81. C. arcta. 

 i, Perigynia broadest near the middle. 



Plant glaucous; leaves 2-4 mm. broad; spikes with 

 many appressed-ascending glaucous obscurely 

 beaked perigynia. 

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



rarely 1.5 cm. apart; perigynia 2.3-3 mm. long . 32, C. canescena. 

 Spikes 4r-1 mm. long, subapproximate or remote: 



perigynia about 2 mm, long . . . (82) (j. canescena, v. aubloliacea. 

 Spikes 6-12 mm. long, remote, the lowest 2-4 cm. 



apart (32) C. canesemta, v. diaju?)cta. 



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

 spikes wi-th few loosely spreading dark green or 



brown distinctly beaked perigynia . . . . 33. C f}rti/ivn6scena. 

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

 globose loosely flowered silvery spikes ; perigynia 

 oblong, beakless, nerved, 3-3.4 mm. long . . .36. O. ten'u^flora. 

 Qf. Perigynia smooth throughout j. 



). Spikes whitish, silvery 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. tt'iaperma. 



Leaves setaceous, 0.8-0.5 mm. broad . . (37) C. tri'Sperina, v. Billing hH. 

 Spikes continuous In a linear-cylindric loose inflores- 

 cence, bractless or only short-bracted ; perigynia 



2-3 mm. long 32. C. canescens. 



Inflorescence subglobose, of 2-4 closely approximate sub- 

 globose loosely flowered spikes ; perigynia beakless. 



3 mm. or more long 36. C tenwiflora. 



^, Spikes ferruginous or dark brown ; terminal spikes with 

 conspicuous clavate base ; perigynia abruptly beaked \ 

 culms smooth (or harsh only at tips). 



