u 



figures distinguish the two admirably. - Kentucky, Shorty Dela- 

 ware, Canby, CoinmonSy and southward. 



17. — Carex Hoodii, Boott, Hook. FL Bor.-Am. ii. 211, t. 211 



(1840), and 111. 17 (Excl. Thurber's No. 16), t. 46 

 (1858), V. s. Hb. Boott. 

 C, muricata, Linn., van cottjixa, Bailey, Bot. Gaz. x. 203 



(1885). 



Tall and slender, but erect, the culm (i to 2 ft. high) pro- 

 longed beyond the leaves ; spikes several to many, very few- 

 flowered, compacted into an ovoid or oblong head three-fourths 

 inch or less long ; perigynium spreading, small and narrow, 

 gradually contracted at both ends, green, nerveless or nearly so, 

 conspicuously green-wnng-margined, rough on the angles, about 

 the length of the brown or tawny scale. (239b.) Montana, 

 Idaho, Oregon and Washington. 

 ^ Van NERVOSA. 



Very tall and slender, (2 to 3 feet high) ; head looser ; .peri- 

 gynium browner throughout, more prominently winged, con- 

 spicuously nerved on the outer face. California, Kellogg and 

 Harfo7'd^ 1069; Marsh at Seattle, Washington, Howell. 



• 18. — Carex occidentalis. 



C, mtiricata, Olney, Bot. King's Rep. 362, in part (1871); 



W. Boott, Bot. Wheeler's Surv. 277 (1878); Bailey, 



Coulter's Man. 390 (1885). 

 C. nmricata, L., van Americana, Bailey, Proc. Amer. Acad. 



Arts and Sci. xxii. 140 (1886). 



Glaucous; leaves narrower than in the last, and relatively 

 longer ; spikes more or less scattered into a very slender head 

 an inch or so long, the lowest one or two usually wholly 

 distinct ; bracts scale-like, inconspicuous ; perigynium larger 

 than in the last, turgid-ovate, abruptly short-beaked, nearly mar- 

 ginless and often smooth ; scales muticous. (239c.) Moun- 

 tains, Montana to Arizona. 



19. — Carex HoOKERIANA, Dewey, Sill. Journ. (I.) xxix, 



248. f. 75 (1836). 



C. micricata, L., van gracilis, Boott, 111. 193. 



Very slender ; head interrupted, castaneous, small, the spikes 

 sometimes alternately arranged ; bracts of the two or three lower 

 spikes produced into long awns, which surpass the spikes; peri- 



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