CYPERACEAE. 71 



Scales obtuse or obtusish, purple with 



broad green midrib and pale 



margins; perigynia green or 



straw-colored. 



Leaves 3-5 mm. wide; staminate 



spikes often 2. C. dives. 



Leaves 1-3 mm. wide; staminate 

 spike solitary. 

 Perigynium 2 mm. long. C. kelloggii. 



Perigynium 2.5-3 mm. long. 

 Spikes scattered; perigynia 



straight, appressed. C. lenticularis. 



Spikes aggregated; peri- 

 gynia curved, spread- 

 ing. C. hindsii. 



Carex stenochlaena (Holm) Mackenzie. Tufted, glabrous, dioecious; 

 stems erect, 15-40 cm. high; leaves flat, 1-3 mm. wide, shorter than the stem; 

 spike solitary, cylindric, erect, densely-flowered, 20-30 mm. long; perigynia 

 lanceolate, pubescent, 2-nerved, the short beak entire; scales dark brown, 

 strongly ciliate, nearly as long as the perigynia. 



In the mountains at about 2000 m. altitude. 



Carex breweri Boott. Tufted; culms 10-40 cm. high, smooth; leaves 

 numerous, narrow, stiff, shorter than the stems; spike solitary,ovate to globular, 

 obtuse, brown, 10-25 mm. long; staminate flowers at the top, few; perigynium 

 ovoid, very thin, much inflated, finely nerved, short-beaked, 6-7 mm. long, 

 the whitish orifice oblique; scales ovate, acute, hyaline-margined, shorter 

 than the perigynium. 



At high altitudes. Mount Hood and southward. 



Carex paddoensis Suksdorf. Very similar to C. breweri; stems 10-15 cm. 

 high; leaves filiform, stiff, mostly exceeding the stems; heads solitary, dark- 

 brown, ovoid and acute, about 1 cm. long; perigynia elliptic-lanceolate, thin, 

 not much inflated, obscurely nerved, 5 mm. long, short-beaked; scales ovate- 

 lanceolate, acuminate, not hyaline-margined, about as long as the perigynia, 

 firm, the tips spreading. 



Mount Adams (by some called Mount Paddo), Suksdorf; abundant on 

 Mount Rainier at 2700 m. altitude. Piper, Allen. 



Carex pauciflora Lightf. Rootstocks elongated; stems slender, 10-40 

 cm. high; leaves shorter than the stem, flat, very narrow; spikelet solitary, 

 few-flowered, staminate above; perig>^nia lanceolate, acuminate, obscurely 

 nerved, green, 6-8 mm. long, strongly reflexed and readily deciduous when 

 mature; stigmas 3. 



In bogs, rare in our limits. 



Carex nigricans C. A. Mey. Rootstock creeping; stems 5-40 cm. high; 

 leaves flat, 2 mm. broad, shorter than the stems; spike solitary; staminate 

 flowers many in the upper half of the spike; perigynia lanceolate, stipitate, 

 spreading; scales dark brown, acute, about as long as the perigynia. 



Common in the mountains above timber line. 



Carex pyrenaica Wahlcnb. Tufted; stems 5-15 cm. high; leaves filiform, 

 involute, longer or shorter than the stems; spike solitary, oblong, pale to dark 

 brown; staminate flowers few at the summit of the spikes; perigynia lanceolate, 

 stipitate, shiny, appressed; scales brown, acute, equalling the perigynia. 



Common in the mountains at about 2500 m. altitude. 



Carex geyeri Boott. Densely tufted, 30-45 cm. high; leaves flat, rigi<l, 

 very scabrous, 2 mm. wide, about as long as the stems; inflorescence a single 



