GENUS 18. SEDGE FAMILY. 



38. Carex ursina Dcwey. Bear Sedge. Fig. 905. 



Carex ursina Dewey, Am. Journ. Sci. 27: 240. 1835. 

 C. glareosa var. ursina Bailey, Carex Cat. 3. 1884. 



Culms low, tufted, erect or slightly curving, 2\' or 

 less tall, smooth, from slender rootstocks. Leaves i" 

 wide or less, involute toward apex, about equalling 

 the culm; bracts usually absent; spike solitary (or 

 rarely with a very small second one at base), brown, 

 obovoid or suborbicular, 2"~3$" long, 2" wide, gynae- 

 candrous, but slightly clavate at base; perigynia 7-15, 

 appressed, ovate, not margined or serrulate, i" long, 

 a little more than \" wide, rounded and stipitate at base, 

 light colored, weakly nerved, abruptly tipped with .a 

 very minute beak; scales ovate, strongly brownish- 

 tinged, obtuse, slightly shorter than perigynia ; achene 

 filling perigynium ; stigmas 2. 



Circumboreal. Summer. 



39. Carex Lachenalii Schk. Arctic Hare's-foot Sedge. Fig. 906. 



Carex Lachenalii Schk. Riedgr. 51, pi. Y, f. 79. 1801. 

 Carex lagopina Wahl. Kongl. Vet. Acad. Handl. (II.) 24: 

 145. 1803. 



Culms stiff, erect, smooth, except immediately be- 

 neath head, 3'-i6' tall, from slender rootstocks. Leaves 

 flat, not involute, \"-\\" wide, shorter than the culm, 

 bracts very short or wanting; spikes 2-6, gynaecandrous, 

 oblong, dark brown, narrowed at the base, 2.%'-$" long, 

 \\"-2\" thick, densely many-flowered, clustered at 

 the summit or the lower .somewhat separated; perigynia 

 appressed-ascending, elliptic or obovate, i"-ij" long, 

 firm, lightly several-nerved, narrowed at the base, rather 

 abruptly tipped by the beak ; scales ovate, brown, 

 hyaline-margined, obtuse to acutish, shorter than the 

 perigynia; achene filling perigynium; stigmas 2. 



Circumboreal, extending south to Quebec and Labrador 

 and in the western mountains to Colorado and California. 

 Summer. 



Carex helvola Blytt, supposed to be a hybrid between 

 this species and Carex canesccns L., is reported from 

 Greenland and Labrador. 



40. Carex amphigena (Fernald) Mackenzie. 

 Northern Clustered Sedge. Fig. 907. 



C. glareosa var. amphigena Fernald, Rhodora 8: 47. 1906. 

 C. glareosa Wahl. Flora Danica 14: pi, 2430, and of most 



authors. 

 C. amphigena Mackenzie, Bull. Torr. Club 37: 246. 1910. 



Resembling Carex glareosa and Carex Lachenalii. 

 Culms weak and slender, 2 r -i8' tall, smooth, except im- 

 mediately beneath head, from slender rootstocks. 

 Leaves narrow, i"-f" wide, involute ; spikes 2-8, 

 gynaecandrous, oblong or subglobose, 2i"-6" long, 

 ii"-2" wide, brown, subtended by very small scale- 

 like bracts; perigynia 5-10, broadly elliptic, li" long, f" 

 wide, strongly several-nerved, pale or brownish at 

 maturity; scales ovate, obtusish, brown with hyaline 

 margins ; achene filling perigynium ; stigmas 2. 



Circumboreal, extending south along the coast to Labra- 

 dor and Quebec. Summer. Erroneously illustrated in our 

 first edition as Carex glareosa Wahl. 



