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ON THE GEOLOGY AND NATURAL HISTORY 
C. Icevi-conica , Dew. Along Big Sioux. Staminate spikes 2 or 3, cylindric and slender; 
pistillate spikes 2, sometimes 3, cylindric, erect, oblong, subdensi-flowered, leafy- 
bracteate, the lowest short pedunculate and vaginate; stigmas three; fruit long-conic, 
slender and tapering, scarcely inflated at base, bifurcate, and oblique at the orifice, 
smooth and obsoletely striate, as long or a little longer than the ovate and lanceolate 
scale ; culm tall and slender. (American Journal of Science, Yol. XXIV, p. 47, 
Second Series.) The smooth and slender conic fruit and scale remove this plant 
from G. trichocarpa. 
C. acuta, Linn. Eagle-nest creek. 
G. vulgaris ? Fries. Eagle-nest creek. 
G. stricta, Lam. Eagle-nest creek. 
G. strior, Dew. Eagle-nest creek. 
C. recta , Boott. Near Fort Pierre. Discovered by the English Exploring Expedition in 
Arctic America, and described by Dr. Boott. 
G. Nebraslcenis, Dew. Near Fort Pierre. Staminate spikes two, oblong and near, the 
lower small and sessile; pistillate spikes two to four, oblong, short-cylindric, densely 
flowered, the upper often staminate at their apex and sessile, the lower short-peduncu¬ 
late, all with leafy bracts ; fruit with two stigmas, convex, obovate or elliptic, short- 
pointed above, and tapering at the base, a little shorter than ovate and acute, or 
lanceolate scale; stem about a foot and a half high, sharp-triquetrous edges, and 
smooth, leafy towards the base. (American Journal, Yol. XVIII, p. 102, Second 
Series.) 
C. Haydenii , Dew. Near Fort Pierre, and at Eagle-nest creek. Staminate spike single, 
sometimes two, cylindric, the lower sessile, and sometimes with flowers at the base ; 
pistillate spikes three to five, long-cylindric, erect, graceful or slender, 2 to 3 inches 
long; base flowered, especially at the lower part of the spikes, one or more staminate 
at the apex, sessile except the lowest; fruit, distigmatic , elliptic, convex, short-beaked, 
and entire at the orifice, about half the length of the scale, which is lanceolate, black, 
white line on the back, culm 2 to 3 feet high, rather slender, leafy at the base.'* 
* When Sprengel printed his Systcma Ycgetabilium, Yol. Ill, in 1826, it contained 267 species of Carex, 
all the lteed grasses or sedges then known to him,—a very host of species of one genus. Since that time the 
number has increased to 800 or more. Perhaps 850 of these have been found in North America, and about 250, 
to speak in general terms, have been found in the United States, east of the Mississippi. The above Catalogue 
contains more than 50 species, collected in Nebraska Territory, most of which are spread over a wide extent of 
our country, so prolific in vegetable life. C. D. 
