10 



12. 



J 



(7. nigra, Olney, Exsicc. fasc. v. 24 (1871), v, s. 



6^. atrata, L., var. nigra, Olney, Bot. King's Rep. 371 (1871) ; 

 W- Boott, Bot. Calif, ii. 239 (1880); Bailey, Coulter's 

 Man. 388 (1885), Proc. Amer. Acad. Arts and Sci. xxii. 

 77(1886.) 



Differs constantly from C. atrata^l^,, as follows: Spikes three 

 or four, globular, strictly sessile, and very densely aggregated in- 

 to an ovoid-triangular head, the lower spikes oi which arc squar- 

 rose, or the lower one rarely distinct; perigynium broadly ovate 

 or nearly circular in outline, thin and whitish, very conspicuously 

 squarrose, broader than the ovate and muticous black scale. 

 (50a.) Mountains, Colorado to California. 



13. — Carex atrata, L., var. OVATA, Boott, 111. 114, t. 362 



(1862), Bailey, Journ. Bot. xxvi. 321 (1888). 

 C. ovata, Rudge, Linn. Trans, vii. 96, t. 9 (1804), v. s. Hb. 

 Kens- 



C, atrata, American authors. 



Habitually more slender than the species and usually lower ; 

 spikes small, oblong or oblong-ovate, reddish-brown, slenderly 

 ped uncled. White Mountains, Smuggler's Notch, Vermont, 

 Brainerd^ and Labrador, Hb. Rudge, 



J 



C. atrata, L., var., W 



vii. 278 (1878) V. s. Hb. Gray. 

 C. atrata, var. ovata, Bailey, Coulter's Man. 388 (1885), 



Proc. Amer. Acad. Arts and Sci. xxii. "j^j (1886). 

 Tail and slender; spikes narrowly cylindrical (an inch or two 

 long and a fourth inch or less wide), the lower one or two on 

 slender peduncles or even radical, the terminal one bearing a 

 very long and much contracted staminate portion; perigynium 

 greenish- white, conspicuously broader and usually longer than 

 the black-purple and faintly white-nerved scale. A pretty plant 

 Colorado to Arizona, on the mountains. 



14. — Carex lurida, WahL, Kongl. Acad. Handl. xxiv. 153 



(1803), V. s. Hb. Holm. 

 C. teJitaciilata, Muhl.; Willd. Sp. PL iv. 266 (1805); Schk., 



