GENUS 18. SEDGE FAMILY. 



38. Carex ursina Dewey. 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, 2-1' 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"-^" 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 i" 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, 2i"-5" long, 

 ii"-2$" thick, densely many-flowered, clustered at 

 the summit or the lower somewhat separated ; perigynia 

 appressed-ascending, elliptic or obovate, i"-if" 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 canescens 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. 2 430, and of most 



authors. 

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



Resembling Carex glareosa and Carex Lachenalii. 

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

 mediately beneath head, from slender rootstocks. 

 Leaves narrow, \"-\ " 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, ii" long, i" 

 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. 



