CYPERACEAB (SEDGE FAMILY) 



217 



176. 

 177. 



178. 



C.folUculaUx. 

 C. Mich axcitiana, 

 C. Hubuldta. 



171. C. gigantea. 



18S. C. roHtrata. 



Leaves 0.5-1.5 cm. broad 



Leaves 1.5-3.5 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 



Tf. Achene longer than broad, the faces flat or slightly convex 88. 



8S, Culm thick and spongy at base, generally smooth and 



bluntly angled above ; leaves prominently nodulose. 



Perigynia flask-shaped, rather abruptly contracted to the 



beak, 8-6 mm. long. 



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



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



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



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



long (183) C rostrata, v. utriculata. 



$6. Culm scarcely spongy at base, sharp-angled above, often 

 harsh ; leaves slightly if at all nodulose tt. 

 tt. Beak of the perigynia usually slightly roughened or 

 serrulate. 

 Pistillatespikescylindric, 2.5-5 cm. long. 1-1.5 cm. thick 184. C. bullata. 

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



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



tt. Beak of perigynia smooth uu. 



iiu. Mature perigynia 5-6.5 mm. thick 



iiu. Mature perigynia not more than 4 mm, thick vv. 

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

 ^vide. 

 Perigynia bladdery 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) O. vesicaria, v. monile. 

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



long (182) C. veHicaria. \. dioienta. 



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

 Perigynia barely inflated, conic-subulate . (182) C. vesicaHa, v. Raeana. 

 vt). Perigynia retrorse or wide-spreading, slightly falcate ; 



leaves soft and ribbon-like, 0,5-1 cm. wide . . 169. C. retrorsa. 



185. O. Thtckermani. 



182, C. vefdcaria. 



1. C. muskingum^nsis Schwein. Culms 1 m. or less 

 nigh, 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. July, Aug. Fig. 

 340. 



2. C. scopHria Schkuhr. Culms 

 0.2-1 m. high, mostly slender and 

 erect ; leaves narrow {at most 3 mm. 

 wide), shorter than the culm ; inflo- 

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

 and ascending approximate ovoid jooin^ed sp^X^es (0,5-1,5 

 cm. long) ; perigynia b{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. coNDENSA Fern aid. Spikes spreading, crov^ded in a globose 

 or subglobose 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 mm. broad, iiumer- 

 842. C. scoparia, ous, the upper often nearly or quite overtopping the cuhn, those 

 ▼. condensa. of the sterile shoots crowded and somewhat distichous; inflo- 



scoparia. 



840. C. muskingumensis. 

 Var. MONILIFORMIS 



