352 



CYPERACEAE. 



180. Carex arcta Boott. Northern Clustered Sedge. (Fig. 850.) 



Ca rexca nescen s var. polystachya Boott; Richards. Arct. 



Exp. 2: 344. 1851. Not C. polystachya Sw. 1803. 

 Carex arcta Boott, 111. 155. pi. 497. 1867. 



Rather light green but not glaucous, culms slen- 

 der, usually strictly erect, \-~2.V 2 tall, rough above, 

 longer than or sometimes overtopped by the leaves 

 which are flat and about i" wide. Lower bract 

 bristle-form and longer than its spike, or short, or 

 wanting; spikes oblong, many-flowered, 3 // -4 // 

 long, about 2 y z " in diameter, all aggregated into a 

 terminal ovoid cluster about i' long, the staminate 

 flowers basal; perigynia pale, ovate, many-nerved, 

 mostly spreading, tapering into a rough beak about 

 one-half as long as the body; scales membranous, 

 pale brown, usually acute, shorter than the peri- 

 gynia; stigmas 2. 



In swamps and wet woods, Maine and New Bruns- 

 wick to Manitoba, Minnesota and British Columbia. 

 June-July. 



181. Carex tenuitlora Wahl. Sparse-flowered Sedge. (Fig. 851.) 



Care.v tenui flora Wahl. Kongl. Vet. Acad. Handl. (II.) 

 24: 147. 1803. 



Light green, culms very slender or filiform, erect or 

 reclining, rough above, S'-2 long. Leaves y^' wide 

 or rather more, flat, usually much shorter than the 

 culm; spikes only 2-4, clustered at the summit, sub- 

 globose, few-flowered, about 2^ // in diameter, bract- 

 less or the lowest with a short bract ; perigynia pale, 

 elliptic, very obscurely few-nerved, narrowed at both 

 ends, \"-\}" long, more than y?." wide, narrowed 

 at both ends, beakless, spreading; staminate flowers 

 basal; scales nearly white, hyaline, acute or obtusish, 

 about equalling the perigynia; stigmas 2. 



In bogs, New Brunswick to Manitoba, south to Maine, 

 Vermont, central New York and Michigan. Local. Also 

 in Europe. Summer. 



182. Carex Heleonastes Ehrh. Hudson 

 Bay Sedge. (Fig. 852.) 



Carex Heleonastes Ehrh.; L. f. Suppl. 414. 1781. 



Culms slender, stiff, erect, very rough above, 6'- 

 18' high. Leaves rigid, erect, becoming involute, 

 less than i" wide, shorter than the culm; bracts 

 very short or none; spikes 3-5, subglobose, several - 

 flowered, brown, about 2%" in diameter, clustered 

 at the summit, the staminate flowers basal ; perigynia 

 broadly ovate or ovate-elliptic, blunt-edged, faintly 

 several-nerved, about \" long, more than W wide, 

 tipped with a short sharp beak; scales ovate, brown 

 with broad hyaline margins, about as long as the 

 perigynia; stigmas 2. 



Hudson Bay to Manitoba and the Canadian Rocky 

 Mountains. Also in Europe. Summer. 





