OF ARTS AND SCIENCES. 141 



Van AUSTRALis, Olney, Hall's PI. Texanag, 25. 



Heads denser than in the species : spikes globular or nearly so : 

 bracts more dilated at the base : perigynium less prominently nerved 

 and much broader. Aspect of typical forms of C straminea. — Wet 

 prairies at Houston, Texas, Hall. Some specimens which were dis- 

 tributed for this by Olney are C. Malilenhergii. 



253. Carex cephaloidea, Boott, 111. 123. 



C. sparganioides, var. cephaloidea, Carey, Gray's Man. 1848, 513. 

 Large and stout, with broad and long flat leaves (about a quarter- 

 inch wide) : perigynium large, broadly ovate, entirely nerveless, wing- 

 margined : heads tawny. Nearest ally is (7. Muhlenbergii. — Illinois 

 to Dakota and Wyoming, McShea. 



254. Carex cephalophora, Muhl. ; Willd. Sp. PI. iv. 220. 

 Throughout the States east of the Mississippi, and on the Great 



Plains of British America, Macoun ; Indian Territory, Butler. 



Var. ANGUSTIFOLIA, Boott, 111. 123. 



G. Leavenworthii, Dewey, Sill. Journ. 2d ser. ii. 246. 



Lower, and leaves short and narrow : heads oblong, tawny : peri- 

 gynium mostly smaller. Distinct in appearance. — Ranges with the 

 species, but evidently not common. 



F. Dioicce, Tuckerman, Enum. Meth. 7. (Nardince, Tuckerman, 1. c. Capi- 

 tate, Christ, Cat. Eur. Car. 11.) Spike one, small ; plants small and slender, 

 often dioecious. 



255. Carex capitata, Linn. Sp. PI. ed. ii. 1381. 



Alpine summits of the White Mountains to Hudson's Bay, Labra- 

 dor, and Greenland. Europe. 



256. Carex Alaskana, Boeckeler, Engler's Bot. Jahrb. vii. part 

 iii. 277. 



" Cespitose : culms few, filiform-setaceous, erect, one and a half to 

 three and a half inches high, nearly terete, smooth, many-leaved at 

 the base : leaves crowded, longer or shorter than the culm, rigid, 

 setaceous, more or less curved, nearly obtuse, canaliculate below, par- 

 tially plane above with denticulate margins : sheaths short, narrow, and 

 nerved, fusco-ferruginous : spike androgynous, oblong-linear becoming 

 oblong-lanceolate (three and a half to four lines long), 8-12-flowered 

 the four to six upper ones staminate : scales thin-membranaceous, 

 small, orbicular-ovate, short-acuminate, the keel one-nerved : perigy- 

 nium (immature) small, erect, green, about equalling the scale, short- 

 Btipitate, oblong, attenuated both ways, the orifice membranaceous, 

 emarginate, the angles above rough. — Alaska, Krause." 



