CYPBRACEAE (SBDGE FAMILY) 



215 



185. C. granular is. 



. granularis, v. Haleana 



186. 0. Orawei. 



187. O, extensa. 



q. Perigynia closely impressed-nerved ; scales rough- 

 awned. 



Sheaths pubescent 128. C. Hitokcockiana 



Sheaths glabrous 129. C. oligocarpa. 



p. Peiigynla oblong-ovold to obovoid or globose, rounded to 

 the sessile or abruptly stort-stipitate base u. 

 u. Closely caespitose, not stoloniferous v, 



V. Culms 1-6 cm. high, more than twice exceeded by the 



leaves and bracts . 180. C. katahdinenbis. 



V. Culms taller; bracts proportionately shorter -w. 

 w. Uppermost bract slightly if at all overtopping the 



staminate spike; perigynia impressed-nerved 181. C. conoidea. 

 tf. Uppei-most bract much overtopping the staminate 

 spike (if rarely shorter, the perigynia with 

 prominent ribs) x. 

 X. Perigynia impressed-nerved y. 

 y. Style jointed below the middle. 



Leaves thin and soft, slightly if at all glaucous. 

 Spikes borne principally in the upper axils. 

 Perigynia oblong. 

 Perigynia turgid, beakless, scarcely 



angled 182. C. grisea. 



Perigynia scarcely turgid, trigonous, 



narrowed to a beak . (182) C. grisea, v. rigida. 



Perigynia subglobose . . . (182) C. grisea, v. glohosa. 

 Spikes borne from the lowest as well as the 



upper axils .... (132) C. grisea, v. angustifoHa, 



Leaves thick and firm, very glaucous . . 138. G. glaucodea. 

 y. Style jointless; perigynia golden-brown , . 134. C. Jlaccoeperma. 

 oc. Perigynia with elevated ribs and short point or 

 beak. 

 Perigynia plump-ovoid to globose 

 Perigynia oblong .... (135) C \ 



M. Culms solitary, from slender stolonifei-ous base 

 a. Perigynia wide-spreading or squarrose, slender-beaked ; 

 spikes mostly toward the summit of the culm ; bracts 

 divergent z. 

 St. Leaves involute ; perigynia spreading-ascending 

 St. Leaves flat ; perigynia squarrose aa. 

 aa. Beak about as long as the body of the perigynium, often 

 bent, at least in maturity. 

 Staminate spike sessile or very short- stalked, some- 

 times pistillate at tip ; pistillate spikes mostly 

 contiguous. 

 Fruiting spikes 9-12 mm. thick, short-cyHndric or 



globose ; beaks spreading in all directions 

 Fruiting spikes 6.5-8 mm. thick, mostly short- 

 cylindric perigynia mostly wide-spreading and 

 strai^htish . . . " . . . . (138) C. flava, v. reatirustn 



Staminate spike usually peduncled ; pistillate mostly 

 remote, tho curved [icrigynia usually retrorse 

 aa. Beak distinctly shorter than body of the perigynium, 

 straight or slightly bent, ascending or horizontally 

 spi-eading. 

 Staminate spike usually peduncled ; pistillate scat- 

 tered .... .... 



Staminate spike usually sessile, often more or less 



pistillate ; pistillate spikes mostly approximate (189) C. Oederi^ v. pumila. 

 P. Bettk or tip of perigyn/ium sharply dideiitate, the teeth acerose bb. 

 bb. Perigynia firm and tough, closely investing the achene co. 

 CO. Teeth less than 1 mm. long, erect dd. 

 dd. Perigynia pubescent. 



Leaves involute-filiform 151. G. filiformis. 



Leaves broad and flat. 

 Scales mostly equaling the densely hairy perigynia . . 152, O. lanuginosa. 

 Scales mostly shorter than the sparsely hairy perigynia 158. 0. Boughtonii. 

 dd. Perigynia glabrous. 



Perigynia broadly ovoid 156. G. striata, 



Perigynia narrowly ovoid. 

 Perigynia more than 5 mm. long, becoming lustrous. 

 Perigynia less than 5 mm. long, dull and minutely papillose 

 cc. Teeth more than 1 mm. long, divergent or recurved ee. 



ee. Scales of staminate spike hairy . 



ee. Scales of staminate spike glabrous. 

 Perigynia hairy. 

 Perigynia ovoid, in slender cyllndric spikes 

 Perigynia lance-subulate, in short-cylindric or ovoid 



spikes ..,,,.,. (158) G. trichocarpa, v. turlnnata, 



perigynia glabrous. 



188. C.Jlata. 



(188) C. flava, v. elatior. 



189. 0. Oederi. 



159. G. riparia, 



160. G. acuiiformis. 



157. G. Urta. 



158. G. trichocarpa. 



