CYPERACEAE (SEDGE FAMILY) 



217 



176. C.folliculata. 



177. G. Michauxiana. 



178. G. aubulata. 



G. 



188. <7. rostraia. 

 G, rosi/rata, v. ambigens. 

 utriculata. 



185. C. Tue&ei'mani. 



182. G. vesicaria. 



Leaves 0.5-1.5 cm. broad 

 Leaves 1.5-3.5 mm. broad 

 pp. Teeth of the beak strongly refracted . 

 ff. Stanjinate spikes 2 or more rr. 

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

 caved 171, 



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



S8. Gulin thick 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 (183; 



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



long (183) G. rostrata 



88. Culm scarcely spongy at base, sharp-angled above, often 

 harsh ; leaves slightly if at all nodulose U. 

 U. Beak of the perigynia usually slightly roug'hened or 

 serrulate. 

 Pistillatespikescylindric, 2.5-5 cm. long. 1-1.5 cm. thick 184. G. hullata. 

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



1.5-2 cm. thick (184) C. hullata, v. Greenii. 



it. Beak of perigynia smooth iiu. 



uu. Mature perigynia 5-6.5 mm. thick 



un. Mature perigynia not more than 4 mm. thick 'OD. 



■y-y. Perigynia ascending, straight; leaves firm, 2-7 mm. 

 wide. 

 Perigynia bladdery inflated. 

 Perigynia ovoid-conic, tapering gradually ip the 



beak . . 



Perigynia rounded-ovoid, rather abruptly tapering 

 to the beak. 

 Perigynia 6 mm. long. 

 Spikes cylindric, 2-7 cm. long . . . (182) G. vesieo/ria, v. monile. 

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



long ... . . (182) G. vesicaria, v. disienia. 



Perigynia 4-5 mm. long . . . (182) G. vesiearia, v. Jejuna. 



Perigynia barely inflated, conic-subulate . (182) G. vesccaria, v. liaeana 

 VK Perigynia retrorse or wide-spreading, slightly falcate ; 



leaves soft and ribbonrlike, 0.5-1 cm. wide . 169. G. retrorsa. 



i, C. mtiskingum§nsis Schwein. Culms 1 m. or less 

 high, very leafy ; leaves suhcordate 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, 



0. to Man. and Mo. July, Aug. Fjg. 



340. 



2. C. scoparia Schkuhr. Culms 



0.2-1 m. high, mostly slender and 



erect ; leaves narroio (at most 3 mm. 



wide), shorter than the culm; inflo- 

 rescence of 3-9 straw-colored or brownish mostly shining 

 and ascending approximate ovoid pointed spikes (0.5-1.5 

 cm. long) ; perigynia ^{rarely 4)-6.5 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 remote. — Less common. 

 Var. coND:feNSA Fernald. Spikes spreading, crowded in a globose 

 or subglobose head. — N. B. to Ont. and Ct. Fig. 342. 

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

 sharply trigonous ; leaves soft and loose, 3-8 mm. broad, numer- 

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

 pf the sterile shoots c^owde^ aud somewhat distichous j ivflo- 



341. C. scoparia. 



340. 0. muskingumensis. 

 Var. moniltf6rmis 



342. 0. scoparia, 

 y. condensa, 



