CYPERACEAE. 

 138. Carex durifolia Bailey. Back's Sedge. (Fig. 808.) 



Care.v Backii Boott; Hook. Fl. Bor. Am. 2: 210. pi. 209. 

 1840. Not C. Backana Dewey. 1836. 



Carex durifolia Bailey, Bull. Torr. Club, 20: 428. 1893. 



Glabrous, culms scarcely \' high. Leaves as- 

 cending or spreading, 6 / -i2 / long, \y-t f '-">" wide, 

 very much overtopping the spikes; spikes 1-3, 

 nearly basal, androgynous, i or 2 of them very 

 slender-stalked, the staminate flowers few, termi- 

 nal, inconspicuous, the pistillate 2-6, subtended by 

 leafy bract-like elongated scales which nearly en- 

 close the inflorescence; perigynia oval, smooth, 

 gradually tapering into a stout subulate beak 

 nearly or quite as long as the body, which is about 

 \y 2 " long and \ f/ thick; stigmas 3. 



In woods and thickets, Ontario to Manitoba, south to 

 Massachusetts, New York. Ohio and Michigan. Also 

 in Colorado (according to Bailey). Ma3--June. 



' 



139. Carex rupestris All. Rock Sedge. 

 (Fig. 809.) 



Care.v rupestris All. Fl. Fed. 2: 264. pi. 92. f. i. 1785. 

 Carex Drummondiana Dewey, Am. Journ. Sci. 29: 

 251. 1836. 



Culms rather stout, obtusely 3-angled, erect, i'- 

 6' tall. Leaves l /z ff -\' f wide, involute in drying, 

 often curved, shorter than or exceeding the culm; 

 bract subulate, erect, shorter than the terminal soli- 

 tary androgynous spike or wanting; spike 6 // -i2 // 

 long, the pistillate flowers few, basal; perigynia 

 erect, smooth, obovoid or elliptic, firm, faintly few- 

 nerved, about 2 /x long, the beak stout, cylindric, 

 about one-half as long as the body; scales purple- 

 brown, ovate, obtuse or subacnte, wider and longer 

 than the perigynia; stigmas 3. 



Labrador and Greenland to British Columbia, south 

 in the Rocky Mountains to Colorado. Also in northern 

 Europe and Asia. Summer. 



140. Carex supina Willd. Weak Arctic Sedge. (Fig. 810.) 



Carex supina Willd.; Wahl, Kongl. Yet. Acad. Handl. 

 (II.) 24: 158. 1803. 



Glabrous, densely tufted, culms slender or nearly 

 filiform but erect, sharply 3-angled, 4'-ro' tall. 

 Leaves about %" wide, rough-margined, flat, shorter 

 than the culm, erect or reclining; lower bract short, 

 subulate; staminate spike solitary, sessile or very 

 nearly so, 3 // -6 // long; pistillate spikes 1-3, sessile 

 near the summit of the culm, subglobose or oblong, 

 few-flowered, 2 // ~3 // long, the upper one sometimes 

 consisting of only 1-3 flowers; perigynia ovoid, 

 smooth, hard, nerveless, about i" long, less than 'i " 

 thick, 3-angled, tipped with a very short beak; scales 

 ovate, brown-purple or lighter-margined, obtuse or 

 subacute, equalling or rather longer than the peri- 

 gynia; stigmas 3. 



Northern Minnesota (according to Bailey) and Mani- 

 toba to arctic America and Greenland. Also in northern 

 Europe and Asia. Summer. 





