CYPERACEAE (SEDGE FAJVIILY) 



217 



176. C.folliculata.. 

 17T. C. Michauxiana. 

 178. C. subulata. 



183. <7. rostraia. 



8S. 



U. 



Leaves 0.5-1.5 cm. broad .... 

 Leaves i.5-3.5 mm. broad .... 

 pp. Teeth of the beak strongly refracted . 

 ff. Staminate spikes 2 or more rr. 

 rr. Achene distinctly broader than long, its faces strongly con- 

 caved . ' . . . 171. C. giganUa. 



rr. Achene longer than broad, the faces flat or slightly convex *.?. 



88. Culm tliick and spongy at base, generally smooth and 



bluntly angled above ; leaves prominently nodulose. 



Perigynia flask-shaped, rather abruptly contracted to the 



beak, 3-6 mm. long. 



Stout ; spikes cylindric, 2-10 cm. long .... 



Slender ; spikes globose or short-cylindric, 1-2.5 cm. 



long (1S3) C. rostrata, v. amhigens. 



Perigynia tapering gradually to the beak, 0.5-1 cm. 



long (183) C. rostrata, v. utriculata. 



Culm scarcely spongj' at base, sharp-angled above, often 

 harsh ; leaves slightly if at aU nodulose tt. 

 Beak of the perigynia usually slightlj- roughened or 

 serrulate. 

 Pistillate spikes cylindric, 2.5-5 cm. long. 1-1.5 cm. thick 184. 

 Pistillate spikes globose to thick-cylindric, 1-4 cm. long, 



1.5-2 cm. thick (184) C. 



tt. Beak of perigynia smooth mt. 



uu. Mature perigvnia 5-6.5 mm. thick 



V/it. Mature perigynia not more than 4 mm. thick w. 



w. Perigj-nia ascending, straight ; leaves firm, 2-7 mm. 

 wide. 

 Perigynia bladderv inflated. 

 Perigynia ovoid-conic, tapering gradually to the 



beak 



Perigynia rounded-ovoid, rather abruptly tapering 

 to the beak. 

 Perigynia 6 mm. long. 

 Spikes cylindric, 2-7 cm. long . . . (182) C. vesicaria, v. nionile. 

 Spikes globose to short-cylindric, 1-2.5 cm. 



long (182) C. vesicaria, v. distenia. 



Perigynia 4-5 mm. long .... (182) C. vesicaria, v. jejuna. 

 Perigynia barely inflated, conic-subulate . (182) C. vesccaria, v. Rae<inar 

 Wt. Perigynia retrorse or wide-spreading, slightly falcate ; 



leaves soft and ribbon-like, 0.5-1 cm. wide . . 169. C. retrorsa. 



185. 



C. bulkita. 

 huUata, v. Greenii. 

 C. Tuckermani. 



182. G. vesicaria. 



1. C. muskingumensis Schwein. Culms 1 m. or less 

 high, very leafy ; leaves subcordate at their junction with 



the loose green sheaths, those of the 

 sterile shoots crowded and almost dis- 

 tichous ; inflorescence oblong, of 5-12 

 appressed-ascending pointed spikes; 

 perigynia very thin and scale-like, 

 barely distended over the achenes. — 

 Meadows, swamps, and wet woods, 

 O. to Man. and Mo. Julv, Aug. Fig. 

 340. 



2. C. scoparia Schkuhr. Culms 

 0.2-1 m. high, mostly slender and 

 erect ; leaves narrow (at most 3 mm. 

 if^ide), shorter than the culm ; inflo- 

 rescence of 3-9 straio-colored or broirnish mostly shininr/ 

 and ascending approximate ovoid pointed spikes (0.5-1.5 

 cm. long) ; perigynia b{rarely 4)-().5 mm. 

 long. — Low ground or even dry open 

 soil, rarely in woods, Nfd. to Sask. and 

 Ore., and southw. May-Aug. Fig. 341. 



Tuckerm. Spikes scattered, the lowest reunite. — Less common. 

 Var. coNDENSA Fernald. Spikes .spreading, cnncded in a globose 

 or sube;lobose head. — N. B. to Ont. and Ct. Fig. 342. 



3. C. tribuloides Wahlenb. Culms loose, 0.3-1 m. high, 

 sharply trigonous ; leaves soft and loose., 3-8 mni. hroad, numer- 

 ous, the upper often nearly or quite overtopping the culm, those 

 of tlie sterile shoots crowded and somewhat distichous; injlo- 



341. C. scoparia. 



040 C. 

 Var. 



muskingumensis. 

 MONILIFORMIS 



o42. C. scoparia, 

 V. condensa. 



