SEDGE FAMILY 



305 



50. Carex straminiformis Bailey. 

 Mount Shasta Sedge. Fig. 726. 



Carex stiamiiica congesta Olney, Proc. Am. Acad. 7: 393. 1868. 

 Carev straminiformis Bailey, Mem. Torrey Club 1: 24. 1889. 



Densely cespitose, the culms 2.5-4 dm. high, strict but 

 slender, slightly roughened beneath head. Leaf-blades 

 2-3 mm. wide: head 1.5-2.5 cm. long containing 3-6 

 closely aggregated suborbicular spikes 6-9 mm. long 

 and nearly as wide with many spreading-ascending 

 perigynia ; bracts inconspicuous ; scales ovate-lanceolate, 

 acute, shorter than perigynia, reddish-brown with 

 lighter midvein and hyaline margins ; perigynia broadly 

 ovate. 5 mm. long, 3 mm. wide, serrulate to middle, 

 strongly winged to the rounded base, thin, lightly nerved 

 dorsally, nerveless or nearly so ventrally, the margins 

 conspicuously wrinkled dorsally, abruptly beaked, the 

 beak tiat, bidentate, one-third length of body; achenes 

 lenticular: style slender, jointed with achene ; stigmas 2. 



High mouiuain summits, Canadian to Arctic-Alpine Zones; 

 Washington through Oregon and northern California to western 

 Nevada, and Mount Whitney, California. Type locality: Mount 

 Shasta, California. 



51. Carex multicostata Alackenzie. 



AIan\-ribbed Sedge. 



Fig. 



727. 



Carex multicostata Mackenzie, Bull. Torrey Club 43: 604. 1917. 



Cespitose, the culms rather stout, 3-9 dm. high, many striate, 

 bluntly triangular, slightly roughened beneath head. Leaf-blades 

 2.5-6 din. wide ; spikes about 10, closely aggregated, oblong or 

 oblong-ovoid, 8-16 mm. long, 6-8 mm. wide, gynaecandrous, with 

 20-30 appressed perigynia ; lower bracts little developed : scales 

 ovate, obtuse to acute, reddish brown with lighter midvein and 

 conspicuous hyaline margins ; perigynia ovate, plano-convex, 

 thick, the margins not wrinkled, green or in age straw-colored, 

 3.5-4.5 mm. long, 2-2.5 mm. wide, winged to the rounded base, 

 serrulate to below middle, conspicuously many nerved dorsally 

 and several-nerved ventrally, abruptly contracted into a broad, 

 flat, bidentate non-hyaline reddish brown tipped beak, winged 

 and serrulate to the tip ; achenes lenticular, substipitate ; stig- 

 mas 2. 



Mountains of southern California, Transition and Canadian Zones. 

 Type locality: Bear Valley Dam, San Bernardino County, California. 



52. Carex petasata Dewey 



728. 



Liddon's Sedge. 



Fig. 



Carex petasata Dewey, Am. Journ. Sci. 29: 246. /'/. W. /. 72, 1836. 

 Carex liddonii Boott in Hook. Fl. Bor. Am. 2: 214. /■/. 215. 1840. 



Cespitose, the culms 3-8 dm. high, obtusish, smooth or nearly 

 so. Leaf-blades flat, 2-3 mm. wide; head erect, 2-4 cm. long, 

 1-1.5 cm. wide, the spikes 3-6, gynaecandrous. aggregated, oblong- 

 ovoid, 8-16 mm. long (or the terminal longer and long clavate), 

 6-9 mm. wide, many-flowered ; bracts little developed ; scales 

 ovate, acute, slightly longer and wider than mature perigynia, 

 reddish brown with lighter center and broad white hyaline mar- 

 gins; perigynia narrowly ovate-lanceolate, appressed, 6-7 mm. 

 long, 2.25 mm. wide, narrowly winged to the base, flat but 

 strongly dilated over the achene, strongly many-nerved on both 

 faces, round-tapering at base, serrulate winged above, tapering 

 into the shallowly bidentate beak scarcely 2 mm. long ; achenes 

 lenticular, jointed with the slender style; stigmas 2. 



Meadows and open woods. Transition and Canadian Zones; Saskatchewan 

 to Colorado, west to Nevada, eastern Oregon and Washington. Type lo- 

 cality : Rocky Mountains. 



