18 



perigynium. Indeed, it is doubtful if most of the western plants 

 which have been referred to C. vulgaris do not belong to this ap- 

 parently green form of C. lenticularis. Undoubted C. lenticiila- 

 ris was collected in 1858 by Lyall, in the Oregon Boundary Sur- 

 vey (Sumass Prairie, 49""), and probably Brewer's 2099, from 

 California, is the same. 



Another plant which has been referred to C. lenticularis^ in 



Cahfornia, seems to merit provisionally, at least, the following 

 disposal : 



/ 25. — CaREX INTERRUPTA, Bceckl., var. IMPRESSA. 



Spikes mostly shorter (usually an inch or less), little or not 

 at all attenuated at the base, the lowest one not as long-pedun- 

 cled ; perigynium considerably larger, strongly few-nerved. 

 Summit Camp, Cal, Kellogg^ Yosemite Valley, Bolander, 6198, 



p.p. The plant provisionally referred, in my Synopsis (p. 87), to 

 C, acuta var. pallida, Boott, said to have been collected in Maine 

 by Blake or Porter, and distributed by Olney as C, lenticularis, is 

 C, interriipta, var. inipressa. The plant apparently belongs to 

 Kellogg's collection, coming into some of Olney's sets by mis- 

 take. 



4 26. — Carex variabilis. 



C^ limula, Olney, Bot King's Rep. 367 (1871) v, s, Hb. Gray. 

 C^ aquatilis, W. Boott, Bot. Wheeler's Surv. 277 (1878) v. s. 



Hb. Gray. 

 C. aquatilis, var. VV. Boott, 1. c, v. s. Hb. Gray. 

 C. stricta, Bailey, Coulter's Man. 385 (1885). 

 C. aperta, Boott, var. divaricata, Bailey, 1. c. 



3j 



Glaucous ; mostly low (2 ft. or less high), stout; culm 

 sharply angled, roughish on the angles; leaves rather broad (as 

 compared with C, stricia, Lam.); spikes three or four, short and 

 stout (2 in. or less long), borne near the top of the culm, erect, 

 the lower one or two conspicuously attenuated at the base, and 

 appearing clavate, the upper sessile, lower peduncled; bracts 

 leaf-like and broad, the lower one or two equalling or exceeding 

 the culm ; perigynium small and broadly ovate, abruptly and very 

 shortly beaked, nerveless, beak entire, green or w^hitish, conspicu- 

 ously broader and usually shorter than the obtuse or muticous black 

 scale. (72^). Colorado, Vasey 582, Hall & Harbour 616 in 



