52 



THE GENUS CAREX IN CALIFORNIA 



staminate part 5-10 mm. long, and 1.5-3 mm. wide with oblong-ovate striate ob- 

 tusish straw-colored scales, and 2 or 3 perigynia, the lower in the axils of short- 

 awned scales, the upper in the axils of obtusish or acutish scales, which are straw- 

 colored with hyaline margins and largely conceal the perigynia; perigynia appressed- 

 ascending, oblong, triangular, 6 mm. long, straw-colored, smooth, shining, the sides 

 2.5 mm. wide, 2-keeled but otherwise nerveless, tapering to the short-stipitate base, 

 rounded at apex and abruptly minutely beaked, the beak entire or nearly so, 

 minutely denticulate around the base. 



Type Locality: Rocky Mts., North 

 America (Geyer 332). 



Dry mountain sides and open 

 woods, Alberta and Colorado to Washing- 

 ton and northern California. 



Loc: Mt. Eddy, Siskiyou Co., Eggleston 

 , -mum**- /,Wh, #7/ 11620. 



U J II »\\ UP I I \ I Rep.: Carex Geyeri Boott, Trans. Linn. 



Soc. 20: 118 (1846). 



XVI. Filifoli^e Tuckerm. Densely cespi- 

 tose. Leaf-blades filiform or narrow. 

 Spike solitary, linear or linear-oblong, 

 androgynous, densely flowered, bract- 

 less. Perigynia more or less triangu- 

 lar, nerveless except for the 2 lateral 

 ribs, submembranaceous, not stipi- 

 tate, not inflated, puberulent or 

 pubescent, beaked or nearly beakless, 

 hyaline tipped and obliquely cut at 

 apex. Achenes triangular, apiculate. 

 Style slender, very short, jointed 

 with achene, at length deciduous. 

 Stigmas 3. 



62. C. exserta Mackenzie. (Fig. 

 24). Densely cespitose, the culms very 

 slender and wiry, 5-25 cm. high, obtusely 

 triangular, smooth, the basal sheaths 

 filamentose; leaf-blades acicular, 0.25-0.5 

 mm. wide; spike 7-15 mm. long, the 

 terminal staminate part more than half 

 the whole, the pistillate part up to 6 mm. 

 wide with 2-12 ascending perigynia, the 

 pistillate scales orbicular-ovate, obtuse, 

 dull reddish brown with hyaline margins; 

 perigynia obovoid, 2-5 mm. long, rounded 

 at base and apex, essentially beakless, 

 papillose-puberulent, hyaline and oblique- 

 ly cut at mouth; style black, exserted; 

 rhacheola conspicuous. 



Type Locality: Echo Lake, El 

 Dorado Co., California (Brainerd 111). 



Dry places at elevations between 5000 



and 11,600 feet in the Sierra Nevada from 



Fig. 24. Carex exserta Mackenzie. El Dorado Co. to Tulare Co., and in the 



o, habit, x 2 /s;b, scale, X4;c, perigynium, x 4. San Bernardino Mts.; also in southern 



