Flora of the Palouse Region 37 



C. filifolia Nutt. Densely matted in extensive tufts: culms 10-20 cm. tall: 

 leaves numerous, filiform, about equalling the stem: inflorescence a solitary 

 terminal spike, the upper portion of which is staminate: perigynium trian- 

 gular-ovoid, pale below, darker at apex and very minutely pubescent, the 

 short beak with an entire orifice: stigmas 3. In dry soil, rare within our 

 limits, but exceedingly abundant in western Whitman county. 



C. geyeri Boott. Densely tufted, 30-45 cm. high: leaves flat, rigid, very 

 scabrous, 2 mm. wide, about as long as the stems: inflorescence a single ter- 

 minal straw-colored spike, the upper and larger portion of which is stam- 

 inate: pistillate flowers several, usually but one maturing: perigynium smooth, 

 oblong, with a very short entire beak, i-nerved on each side; scales pale or 

 rusty, elongated, acuminate, exceeding the perigynia: stigmas 3. Very 

 abundant on dry hillsides. 



C- stipata Muhl. Culms .5-1 m. tall, sharp-angled: leaves flat, 6-8 mm. 

 wide, shorter than the stem; sheaths somewhat rugulose on the inner side: 

 inflorescence 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 long 

 stout 2-toothed beak, whose margins are serrulate: scales much shorter than 

 the perigynia: stigmas 2. Moist woods and copses. 



C. athrostachya Olney. Culms tufted, 30-60 cm. tall: leaves 2-3 mm. 

 wide, shorter than the stems: inflorescence a dense ovoid straw-colored head 

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

 exceeding the head: perigynia lanceolate, spongy at base, the long beak 

 2-toothed, its margins serrulate: scales acuminate, about equalling the per- 

 igynia: stigmas 2. Common in wet places. 



C. festiva var. pachystachya Bailey. Culms tufted, 30-90 cm. tall: leaves 

 flat, flaccid, 3-4 mm. broad, shorter than the stems: inflorescence a dense 

 oblong head of from 6-12 crowded sessile spikes, these brownish, 1-1.2 cm. 

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

 bidentate, serrulate on the margins; scales acutish, equalling the perigvnia: 

 stigmas 2. Very common in wet meadows. 



C. liddoni Boott. Culms erect, 30-60 cm. tall, scabrous above: leaves 2-4 

 mm. wide, shorter than the stems: spikes 3-6, ovoid or oblong, pointed at 

 each end, 2 cm. long, all androgynous, pale, sessile, distinct but usually 

 close together: perigynium smooth, broadly lanceolate, about 6 mm. long, 

 the broad beak exceeding the akene in length; scales acuminate, about as 

 long as the perigynia: stigmas 3. Rare, in meadows near Pullman. 



C. lanuginosa Michx. Culms erect, slender, 30-60 cm. tall, somewhat 

 tufted: leaves flat, 2-5 mm. wide, as long or nearly as long as the stem: 

 staminate spikes 1-3, sometimes pistillate at base: pistillate spikes 1-3, mostly 

 long peduncled, 18-30 mm. long: perigynia oval, densely pubescent, with a 

 short 2-toothed beak; bracts acute or acuminate, about equal to the perigv- 

 nium: stigmas 3. Swamps near Moscow. 



C. deflexa var. rOSSii Bailey. Densely tufted, the culms 20-40 cm. tall: 

 leaves pale, flat, scabrous, 1-3 mm. wide, commonly equalling the stems: in- 

 florescence of 1-4 spikes, the uppermost staminate: staminate spike slender. 

 2-3 mm. long, pale, long-stalked: pistillate spikes 1-3, distinct, loosely few- 

 flowered: perigynia oblong, pubescent, with a 2-toothed beak; scales purple 

 with hyaline margins or greenish, sharply acuminate, shorter than the 

 perigynia: stigmas 3, rarely 2. Kamiack Butte, in stony soil. 



