Monograph of North American Carices. 293 



— acuminata, Willd. — hordeifornis, WahL 



— pellita, Muhl. — littorea, Labillard. 



— paludosa, Good. — hirta, Wahl. 



— riparia, Good. — cherokeensis, nobis. 



— lacustris, Willd. — trifida, Cavan. 



— melanostachya. — longirostris, Torrey. 



A. Inflorescence dioicous. 

 1. Carex dioica, Linn. 



C. spica simplici ; fructibus erectiusculis, ovatis, nervosis, 

 superne margine hispidis; foliis culmisque glabris. 



C. dioica, Lin. Willd. sp. pi. iv. p. 207. Richardson, app. 

 Frank, nar. ed. 2. p. 34. No 364. 



C. Linnseana, Schk. car. ii. p. 3. t. A. f. 1. 



Hoot creeping. Culm 6 — 8 inches high, slender, triquetrous. Leaves 

 shorter than the culm. Spike oblong; glumes brownish, with a red keel. 

 Stigmas 2. 



Hab. In the woody country of Arctic America, from lati- 

 tude 54° to 64° north. Collected by Dr. Richardson. 



2. Cari x sterilis, Willdenovv. 



C. spicis dioicis, staminif. 3 — 5, pistillif. subsenis (interdum 

 androgynis); fructibus ovatis, compresso-triquetris, mar- 

 gine ciliato-serratis, apice recurvis, bicuspidatis. 



C. sterilis, Willd. sp. pi. iv. p. 208. Schh. car. t. mmm. 

 f. 146. bona. Purshfl. Amer. Sept. i. p. 34. Muhl. gram. 

 p. 217 Elliott, sk. ii p. 525. 



Root strong, fibrous. Culm a span high, obtusely triquetrous, striate, (and 

 thence appearing hexangular) scabrous toward the summit, brownish and 

 sheathed by the leaves at the base. Leaves as long as the culm ; the 

 lower ones shortened, linear, narrow, triquetrous toward the extremity ; 

 margin scabrous. Spikes occasionally (according to Muhlenberg) an- 

 drogynous ; sterile* spikes 3 — 5, alternate, approximate, oblong, acute, 



* I shall use the terras sterile or staminiferous, and fertile or pistilliferons 

 spikes, indiscriminately. 



