SEDGE FAMILY ' 119 



Perigynia 



Nerves of the perigyuia obscured by pubescence, the teeth of beak short. 



Leaf-blades flat, more than 2 mm. wide. 143. C, lanuQ\nom. 



Leaf-blades involute, 2 mm. wide or less. 144. C. lasiocarpa. 



Nerves of the perigynia prominent, the teeth of beak prominent, slender. 



145. C. llouQhtomx. 



B3:ik of the perigynia iticluding teeth nearly as long as body, the teeth 1.5 mm. long or 



more. 



Perigynia glabrous. ,• i ♦^ 



Perigynia ovoid, the teeth less than 2 mm. long, erect or spreading; scales acute 



to aristate; leaf-blades glabrous. , 146. C. lacvicmica. 



Perigynia lanceolate or ovoid-lanceolate, the teeth 2-4 mm. long, widely spread- 

 ing; scales long-arista te ; leaf-blades pubescent beneath. ^ ,^ ^ 

 *=■ 147. C. athvrodes 



Perigynia hairy. 148. C. Sheldonii. 



43. EXTEXSAE. 



Perigvmia 2-3 mm. long, the beak scarcely half as long as the body. . , . , 



°'' 149. C. vtriaiila. 



Ions, the beak about as long as the body. 150. C. flava. 



mm 



44. PaUCIFXORAE. 



exserted: culms with many 



151. C. microalochin. 



^— V ^ _^_ V -m—m- H - - ™ T- -■- -1- -^ — - — — — 



Rhacheola absent or rudimentary, not conspicuously exserted; culms with few leaves. 



45. Pseudo-Cypereae. 



Perigynia suborbicular in cross-section, more or less inflated. 153. C. hyslricina. 

 Perigynia obtusely triangular, scarcely inflated, closely envelopmg achene. 



46. Physocarpae. 



Perigynia scarcely inflated; beak entire or emarginate; stigmas normally two and acher 



lenticular.* 



culms 



155. C. miliaris. 



•igynia ovoid; fertile culms 

 stoloniferous. 



156. C. saxatilis. 

 _„ - -- much inflated; beak bidentate; stigmas normally three and 



achenes triangular. ^ ^ -.-^ ^ ». 



Pistillate spikes globose or short-oblong. 5-15-flowered. 157. C. ohgosperma. 



Pistillate spikes oblong to cylindric. 15-many-flowered. 



Lower perigynia not reflexed; bracts moderately exceeding the spikes. 



Perigynia ascending; lower sheaths more or less strongly filamentose; culms 



sharply triangular. 



Perigynia 6-8 mm. long. . , , .,1 . « ^ 



Perigynia oblong-ovoid, tapering mto the beak; spikes loosely flowered 



at base 1^^- ^''' ^(^^^^<^' 



Perigjmia ovoid or globose-ovoid, contracted into the beak; spikes more 

 closely flowered. ^ 159. C. vesicaria. 



Perigynia 8-10 mm. long, tapering into the beak. 160. C. exsiccata. 

 Perigynia spreading at maturity; lower sheaths not filamentose; culms bluntly 

 triangular below the spikes. 161. C. rostrata. 



Lower perigynia reflexed; bracts many times exceeding the spikes. 



1 Nardixab Kukenth. Very densely cespitose. Leaf-blades filiform. 

 Spike soUtary, linear-oblong, androgjTious, densely flowered, bractless Fen- 

 EVnia ascendmg, biconvex, elliptic-ovate, not inflated, the walk thin, glabrous, 

 striate, stipitate, the beak hyaline-tipped, in age bidentulate. Achenes lenticular 

 or triangular. Stigmas 2 or 3. 



1. C. Hepburnii Boott. Cuhns 2-15 cm. high; sheaths strongly hyaUne- 

 margined above, abruptly contracted into the blades; spike 5-12 mm. long with 

 1-10 Derig\-nia ; scales ovate, acutish, the midvein conspicuous; perigj-nia 3 mm. 

 long ; achenes usually triangular. C ruirdina Anth., m part^ C stantonemis 

 ME Jones. Dry alpine slopes: Alta.— Colo.— ^\ ash.^B.C. Alp.—Subalp. 



Jl-Au. 



2. INFLATAE Kukenth. Cespitose, the rootstocks elongate. Leaf-blades 

 filiform. Spike soUtary, ovoid, androgynous, dei]^ely flowered, bractless 

 Perigynia inflated, the walls very thin slightly nerved, sessile, the smooth beak 

 hyahne tipped, obliquely cut, in age bidentulate. Achenes triangular. Stigmas 



2.' C. Engelmannu Bailey. Culms 5-20_cm. high; leaf-blades about 0.5 

 rrim v.\d^- snike with 15-40 asceuding perigynia; scales 1-nerved, acute to cuspi- 



