CYPERACEAE (SEDGE FAMILY) 



215 



128. C. ffitchcockiana. 



129. C. oligoearpa. 



180. C. katahdinfuU. 



182. O. grisea. 



I 



q. Perigynia closely impressed-nerved ; scales roagh- 

 avvned. 



Sheaths pubescent 



Sheaths glabrous * 



p. Perigynia oblong-ovoid to obovoid or globose, rounded to 

 the sessile or abruptly short-stipitate base t*. 

 U. Closely caespitose, not stoloniferous v. 



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



leaves and bracts 



V, Culms taller ; bracts proportionately shorter ^|}. 

 w. Uppermost bract slightly if at all overtopping the 



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

 W. Uppermost 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 



Perigynia scarcely turgid, trigonous, 



narrowed to a beak . . (132) C. grisea, v. rigida 

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

 Spikes borne from the lowest as well as the 



upper axils .... (132) C. grisea, v. angusti/olia. 

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

 y. Style jointless; perigynia golden-brown . . \M. C.flaccosperma. 

 X. Perigynia with elevated ribs and short point or 

 beak. 

 Perigynia plump-ovoid to globose . . . 135. C. granular is. 

 Perigynia oblong .... (135) C. granularis, v. Ilaleana. 

 u. Culms solitary, from slender stoloniferous base . . 136. C. Crawei. 

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

 spikes mostly toward the summit of the culm ; bracts 

 divergent z. 

 z. Leaves involute ; perigynia spreading-ascending 

 z. Leaves flat ; perigynia squarrose aa. 

 aa. Beak about as long as the body of the perlgynium, 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-cylindric or 



globose ; beaks spreading in all directions 

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

 cyUndric perigynia mostly wide-spreading and 



straightish (138) C. flava, v. rectirostra. 



Staminate spike usually peduncled ; pistillate mostly 

 remote, the curved perigynia usually retrorse 

 eta. Beak distinctly shorter than body of the perigynium, 

 straight or slightly bent, ascending or horizontally 

 spreading. 

 Staminate spike usually peduncled ; pistillate scat- 

 tered 



Staminate spike usually sessile, often more or less 



pistillate ; pistillate spikes mostly approximate (189) C. Oederi, v. pumiln. 

 P. Beak or tip of perigynium sharply Mdentate, the teeth acerose bb. 

 bh. Perigynia firm and tough, closely investing the achene cc. 

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

 dd. Perigynia pubescent. 



Leaves involute-filiform 



Leaves broad and flat. 

 Scales mostly equaling the densely hairy perigynia . 

 Scales mostly shorter than the sparsely hairy perigynia 

 dd. Perigynia glabrous. 



Perigynia broadly ovoid 



Perigynia narrowly ovoid. 

 Perigynia more than 5 mm. long, becoming lustrous. 

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

 *, 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 cylindric spikes . . . 



Perigvnia lance-subulate, in short-cylindric or ovoid 



spikes (168) C trichocarpa, v. turhinata. 



Perigynia glabrous. 



. 187. C. exienta. 



188. C.Jlava. 



(188) C. flava, v. elatior. 



189. a Oederi. 



. 151. C.filiformis. 



152. C. lanuginosa. 



158. C. noughtonii. 



155. C. striata, v. brevis 



159. C. riparia. 



160. C. acuti/orniis. 



157. C. hiria. 



158. C. trichocarpa. 



