154 TWELFTH ANNUAL REPORT. 



C niarcida, Boott.* Sedge. 



Red river (open prairie swamp), Dawson, Macoun. West. 



C. eeplialoidea, Boott. Sedge. 



Througliout the state, excepting perhaps northeastward. Frequent in Martin 

 county, and in Emmet county, Iowa, Cratty; swampj, "northwest angle" of lalce of the 

 Woods, Macoun. 



C. cephalophora, Muhl. Sedge. 



Common, or frequent, through the south part of the state. Blue Earth county, 

 Leibero. 



C Mulilenbergii, Schk. Sedge. 



LaplHDii. Chaslca, Carver county, Junl Rare. South. 



C . ro.sea, Schk. Sedge. 



Common, or frequent, throughout the state. Red river (swamp), Dawson, Macoun; 

 Minneapolis, Jitni, Kassubc; Blue Earth county, Lciberg; Hesper, Iowa (frequent), Mrs. 

 Carter; Martin county, and Emmet county, Iowa (common), Cratty. 



C. chordorhiza, Ebrh. Sedge. 



Throughout the state, but infrequent. [North of lake Superior (at Fort William), 

 Macoun; Emmet county, Iowa, Arthur.] 



fj. tenella, Schk. Sedge. 



Throughout the state, excepting far southward. Minneapolis, Juni, Kassube. 



C trisperma, Dew. Sedge. 



Range like the last. Put in bay, lake Superior, Juni. 



C. tenniflora, Wahl. Sedge. 



Range like the two preceding. Minneapolis, Juni, Herriclt. 



C. canesceus, L. Sedge. 



Throughout the state : common northward, less frequent southward. Blue Earth 

 county, Leiberg. 



C. canesceus, L., var. alpicola, Wahl. (var. vitilis. Carey.) Sedge. 

 Agate bay, lake Superior, Juni. North. 



C. arcta, Boott. f Sedge. 



Lake Superior, Rainy lake, and lake of the Woods, Richardson, Boott. North. 



*Cakex marcida, Boott. Spike oblong, pale, composed of numerous small ovate 

 aggregated androgynous spikelets, staminate at top, the lower spikelets compound ; 

 stigmas 2 ; perigynium tawny, suborbicular, or ovate tapering to a bifid beak, plano- 

 convex, nerved, winged, ihe upper margins serrated, short-stipitate, nearly equal to the 

 acute ovate scale, which is of a pale straw-color, with a white membranous margin; 

 achenium tawny, lenticular, contracted at base. Culm l to 2 feet high, rigid ; leaves 

 broad, linear, erect. Olney in Bat. Rep. of Kino's Expl, of the Fortieth Parallel. 



tCAKKX ARCi'A, Boott. Spike oblong, capitate, pale, of 8 to 14 spikelets, which are 

 oblong and obtuse, androgynous, at the base sparingly staminate, many-flowered, 

 closely crowded, the lower bracteate ; bracts bristle-shaped, dilated at the base, longer 

 than the spikelets; stigmas 2 ; perigynia ovate, acuminate-beaked, with the minute 

 orifice emarginate and deeply cleft on the outer side, serrate above on the sharp mar- 

 gins, on the outer side slightly nerved, on the inner more sparingly or obsoletely nerved, 

 spreading, pale-green, at length becoming rusty above, membranaceous, at the base 

 thickly spongy ; longer than (and as broad as) the scale, which is ovate, acute and 

 mucronulate, whitish or rusty-colored, with a greenish margin and a green mid-nerve. 

 . . . Culm somewhat less than a foot high, sharply triangular, rather stout, upwardly 

 roughish, leaved at the base. Leaves l to l'» lines wide, flat, with a prolonged-tapering 

 tip, longer (often much) tlian the culm. Bracts at their base broadly dilated, bristle- 



