CYPERACEAE. 



Ions as the perigynia. This species tends to be dioecious and is sometimes 

 truly BO. Common in alkaline soil. 



Carex athrostachya Olney. Stems tufted, 30-60 cm. tall; leaves 2-3 mm 

 wide shorter than the Btems; inflorescence a dense ovoid straw-colored head 

 composed of 5 20 crowded spikes, these staminate below; lower bracts 2-5, 

 Mir hcul; perigynia lanceolate, spongy at base, the long beak 

 2-tOOthed, it- margins serrulate; scales acuminate, about equalling the peri- 

 gynia. Common in wet places. 



Carex hoodii Boott. Slender, erect, tufted, very smooth, 30-60 cm. high; 

 leaves many, pale, 2-3 mm. broad, shorter than the stems; spikes about 6, 

 densely crowded into an ovoid or oblong head, 1-2 cm. long; perigynia spread- 

 ing, lanceolate, rather thick, 5 mm. long, dark when mature, obscurely nerved, 

 narrowly wing-margined, somewhat stipitate at base, narrowed into a rough- 

 margined beak nearly as long as the body; scales lance-ovate, acuminate, 



nous margined, brownish, as long as the perigynia. In moist places, not 

 common. 



Carex pachystachya Cham. Stems tufted, 30-90 cm. tall; leaves flat, 

 flaccid. 3-4 nun. broad, shorter than the stems; inflorescence a dense oblong 

 head 1<> 12 mm. long, composed of 6-12 crowded sessile brownish spikes; 

 perigynia spreading, ovate-lanceolate, flat, about 4 mm. long, the beak bi- 

 de!: rrulate on the thin margins; scales acutish, equalling the perigynia. 

 . common in wet meadows. 



Carex multimoda Bailey. Very similar to C. pachystachya but the head 

 less dense, one or more of the lower spikes clearly separate or if crowded the 

 head oblong; perigynia indistinguishable. Common in the Blue Mountains. 



Carex arcta Boott. Loosely tufted, pale green; stems 20-60 cm. high, 

 smooth or nearly so; leaves pale green, 2.5^4 mm. long, usually larger than 

 the stems; head ovate-oblong, green or brownish, of 5-12 crowded spikes; 

 -pikes oblong or ovoid, 6-8 mm. long; perigynia spreading, ovate, somewhat 

 cordate, gradually tapering into the serrulate beak, strongly nerved on the 

 Miitcr face, 2-3 mm. long; scales hyaline, often brownish, acute, shorter than 

 the perigynia. In moist meadows and copses. 



Carex stipata Muhl. Stems 50-100 cm. tall, sharp-angled; leaves flat, 

 6-8 mm. wide, -horter than the stem; sheaths somewhat rugulose on the 

 inner ride; inl'.urcscence a dense ovate head of many crowded spikes, 3-5 cm. 

 long, straw-colored or olivaceous, commonly exceeded by the slender lowest 

 bract; perigynia spreading, triangular-ovate, many-nerved, tapering into a 

 •>.iit 2-toothed beak, whose margins are serrulate; scales much shorter 

 than the perigynia. Moist woods and copses. 



Carex diandra ampla (Bailey) Piper n. comb. ( C. leretiuscula ampla Bailey.) 



ly tufted, the slender stems 90-120 cm. high; leaves narrow, 2-4 mm. 



mostly shorter than the stems; spikes 6-20, brown, in elongated often 



i. illy branched inflorescences, 5-12 cm. long; terminal florets stami- 



: perigynia spreading, ovoid, stipitate, nerved at the base on both sides, 3 



'. tin serrulate beak as long as the thick body; scales brown, ovate, 



i < uspidate, as long as the perigynia. In boggy places, Latah 



1 intj . Idaho. 



•x filifolia Nutt. Wool grass. Densely matted in extensive tufts; 



m. tall; leaves numerous, filiform, about equalling the stem; 



solitary terminal spike, the upper portion of which is staminate; 



mi tnangular-ovoid, pale below, darker at apex and very minutely 



nt. the r-hort beak with an entire orifice. In dry soil, sometimes very 



abundant 1 xceedingly difficult to plow up. 



