SEDGE FAMILY 



341 



158. Carex sheldonii Mackenzie. 

 Sheldon's Sedge. Fig. 834. 



Carex sheldonii Mackenzie, Bull. Torrey Club 42: 618. 1915. 



Strongly stoloniferous, the culms 6-9 dm. high, very 

 smooth below the spikes, neither bright colored nor fibril- 

 lose at the base. Leaves about four, the blades 5-6 mm. 

 wide, .2-4 dm. long (or longer on the sterile shoots), spar- 

 ingly short-pubescent' as are the sheaths, the latter dark- 

 tinged at the mouth, the basal breaking and slightly fila- 

 mentose ; staminate spikes 2-3, distant ; pistillate spikes 

 usually two, widely separate, sessile or short-peduncled, 

 oblong-cylindric, 2-5 cm. long, 8-10 mm. wide, rather closely 

 25-60-flowered ; lowest bract sheathing, exceeding inflores- 

 cence ; scales ovate-lanceolate, sharp pointed, exceeded by 

 the perigynia. brownish with several nerved green center 

 and hyaline margins ; perigynia lanceolate, obscurely trian- 

 gular, 5-6 mm. long, 2 mm. wide, little inflated, short- 

 pubescent, prominently about 15-nerved, tapering into a 

 bidentate beak 2 mm. long, the teeth less than 1 mm. long ; 

 achenes triangular ; style slender, straight, continuous with 

 achene ; stigmas 3. 



In swamps, Transition Zone; Idaho to Oregon and northeastern 

 California. Type locality: Clark's Creek, Oregon. 



159. Carex atherodes Spreng. 



835. 



Awned Sedge. 



Fig. 



1792. 



Carex aristata R. Br. Frank. Journ. 751. 1S23; not Honck. 



Carex atherodes Spreng. Syst. Veg. 3: 828. 1826. 



Carex trichocarpa aristata Bailey, Bot. Gaz. 10: 294. 1885. 



Rootstocks with stout stolons, the culms 6-12 dm. 

 high, stout, sharp-angled, smooth or roughish above. 

 Leaf-blades elongated, 4-12 mm. wide, flat, nodulose, 

 more or less pubescent beneath, the sheaths soft pubes- 

 cent, brownish or purple tinged, quickly broken ; stam- 

 inate spikes 2-6, slender, long-stalked ; pistillate spikes 

 3-5, remote, cylindric, sessile or the lower short-stalked, 

 loosely flowered at the base, densely above, 2-10 cm. long, 

 12-16 mm. wide; bracts leaf-like, the lower 1-2 e.xceeding 

 the culm ; scales oblong-lanceolate, the upper shorter than 

 the perigynia. rough awned, 3-nerved ; perigynia ascend- 

 ing, lanceolate, glabrous, conspicuously many ribbed, 

 8-12 mm. long, rounded and substipitate at base, tapering 

 into the very deeply bidentate beak, the teeth widely 

 spreading, 1^ mm. long; achenes triangular, short stipi- 

 tate ; style slender, straight, continuous with achene ; 

 stigmas 3. 



Swamps, Transition Zone; Ontario to Yukon, south to New 

 York, Missouri, Kansas, Utah, and Oregon; also widely dis- 

 tributed in northern Evirasia. Type locality: Arctic America. 



160. Carex viridula Michx. 

 Green Sedge. Fig. 836. 



Carex viridula Michx. Fl. Bor. Am. 2: 170. 1803. 



Carex oederi Schw. & Torr. Ann. Lye. N. Y. 1: 334. 1825; not Retz. 



Carex urbanii Boeckl. Bot. Jahrb. 7: 280. 1886. 



Carex flava recterostrata Bailey, Bot. Gaz. 13: 84. 1888. 



Densely cespitose, the culms 0.7-4 dm. high, smooth, bluntly 

 triangular, not yellowish green. Leaf-blades 1.5-3 mm. wide, 

 canaliculate, the sheaths not prolonged at the throat ; terminal 

 spike usually staminate. sessile or short-peduncled, 3-15 mm. long; 

 pistillate spikes 2-16, oblong or globose-oblong, 4-12 mm. long, 

 4-7 mm. wide, aggregated and sessile or the lower separate and 

 exsert-peduncled, with 15-30 spreading perigynia; bracts leaf-like, 

 usually erect and the lower much exceeding culm, strongly sheath- 

 ing ; scales ovate, much shorter than the perigynia. obtuse or _ 

 acutish, straw-color with greenish midvein and hyaline margins, 

 often reddish brown tinged ; perigynia 2-3 mm. long, obovoid, 

 obtusely triangular, not inflated, many-nerved, tapering at base, 

 abruptly beaked, the beak whitish tipped, minutely bidentate. 

 scarcely half length of body; achenes triangular; style slender, 

 jointed witli achene ; stigmas 3. 



Lake and river banks. Transition and Canadian Zones; Xewfoundland to 

 Alaska, south to New Jersey, Indiana, Colorado, Utah, and northern Cali- 

 fornia. Type locality: Canada. 



