GENUS 18. 



SEDGE FAMILY. 



8. Carex Douglasii Boott. Douglas' Sedge. Fig. 875. 



Car ex Douglasii Boott ; Hook. Fl. Bor. Am. 2 : 213. pi. 214. 

 1840. 



Light green, rootstocks extensively creeping, culms 

 normally dioecious, slender, erect, smooth or nearly so, 

 4/-I2' tall. Leaves l"-ii" wide, somewhat involute in 

 drying, shorter or longer than the culm, tapering to a 

 long tip; spikes linear or oblong, elliptic, 2i"-8" 

 long, several or numerous in a dense terminal oblong 

 or ovoid head i'-2' long; perigynia ovate-lanceolate, 

 about 2" long, less than i" wide, faintly several-nerved, 

 on both sides, rounded at base, the rough, at length 

 bidentate, tapering beak about one-half as long as the 

 body ; scales pale greenish brown, or straw-colored, 

 lanceolate, scarious, smooth-awned, much longer than 

 the perigynia and completely concealing them ; 

 stigmas 2. 



In dry soil, Manitoba to Nebraska and New Mexico, 

 west to British Columbia and California. June-Aug. 



9. Carex Sartwellii Dewey. Sartwell's Sedge. Fig. 876. 



Carex Sartwellii Dewey, Am. Journ. Sci. 43 : 90. 1842. 



Culms slender, stiff, erect, rough above, 3-angled, 

 i-3 tall, from elongated dark rootstocks. Leaves 

 i "-2" wide, mostly shorter than the culm, long- 

 attenuate at the tip ; bracts setaceous, usually very 

 small, or i or 2 of the lower sometimes elongated ; 

 spikes numerous, ovoid or oblong, usually staminate 

 or androgynous, 2"-^" long, usually densely aggre- 

 gated in a narrow but heavy head i'-2 f long and 

 5" wide, or the lower somewhat separated ; perigynia 

 elliptic-lanceolate or ovate-lanceolate, \\"-2." long 

 and |"-i" wide, thin-margined, ascending, nerved on 

 both faces, tapering into a short 2-toothed beak; 

 scales ovate, obtuse or subacute, pale brown, scarious- 

 margined, about equalling the perigynia; stigmas 2. 



In swamps, Ontario to British Columbia, south to cen- 

 tral New York, Illinois, Arkansas and Utah. May-July. 



10. Carex arenaria L. Sand Sedge. Sand-star. 

 Fig. 877. 



Carex arenaria L. Sp. PI. 973. 1753. 



Rootstock extensively creeping, culms erect, slender, 

 slightly scabrous above, 4'~i5' high. Leaves f"-ii" 

 wide, very long-pointed, shorter than the culm; lower 

 bract subulate, sometimes \\' long; spikes oblong, 3"-6" 

 long, aggregated into a terminal ovoid head i'-2 f long, 

 the terminal commonly staminate, the middle ones stami- 

 nate at the top, the lower usually wholly pistillate ; peri- 

 gynia lanceolate, 2"-2i" long, wing-margined above, 

 strongly several-nerved on both sides, the flat strongly 

 2-toothed serrulate beak nearly as long as the body and 

 decurrent on its summit ; scales lanceolate, light brown, 

 long-acuminate or awned, about equalling the perigynia ; 

 stigmas 2. 



On sea beaches near Norfolk, Virginia. Adventive or 

 naturalized from Europe. Stare. Sea-sedge. Sea-bent. June-July. 



