222 CYPERACE^. ElcochariK 



E. Olivacka, Torr., with verj' slender tufted spreading stems 1 to 6 inches high, ovate or 

 oblong-ovate sjnkes 1 to 3 lines long, and a similar nutlet nearly a half-line long hut shorter than 

 the 6 or 8 bristles, has been collected in Coloiado {Grrcw) and Oregon {Hnll), and will probably 

 be also found in Northern California. The Oregon specimen has shorter bristles than the eastern 

 forai, and the tubercle is less sharply contracted at base. 



++ ++ Style S-cleft and nutlet triangular. 



5. E, arenicola, Torr. Stems very slender, sulcate, 6 to 18 inches liigli, from 

 rather slender running rootstocks, erect or sometimes reclining and rooting at the 

 extremity : basal sheaths brown, becoming nearly black : spike ovate or usually ob- 

 long, 2 to 5 lines long, the numerous closely imbricated scales ovate and very obtuse, 

 thin, brown with greenish midvein and pale border : bristles 4 or G, about e(]ualling 

 the very obtusely triangular oblong-obovate nutlet, which is nearly i of a lino long : 

 tubercle much broader than the apex of the nutlet, thick, deltoid, acute. — PI. 

 Lindh. 29, and Bot. Mex. Bound. 228. E. Domheyana, Boeck. in Linn, xxxvi. 450, 

 as to Drummond's plant. 



Frequent in Southern California ; at hot springs near San Bernardino ( Wood, TV. G. WriqlU) ; 

 Santa Barbara (Rot.hrock, n. 58); Los Angeles (xVcrHi) ; Cuiamaca Mountains (Prt/mr/-, n. 386); 

 also collected by Coulter, n. 799. It is common eastward from New Mexico {JFrufht, n. 1958, 

 1959) to South Carolina and Florida, and is the E. Engclmanni of Hall's Texan collection (n. 696), 

 but not of Steudel, which is a form of ^. ohfusa. The Mexican E. truncata, Schlecht. {E. mm- 

 tana, Benth. PL Hartw. 27), which Boeckeler also refers to the Peruvian E. Domhninna, Kunth, 

 is much like the present species, but has larger and less crowded scales, and a somewhat larger 

 and broader nutlet, with longer bristles. 



-I- -1^ Tubercle continuous with the nutlet and not at all constricted at base. 



++ Tubercle flattened, broader than long. 



G. E. obtusa, Schult. Stems tufted, numerous and erect, from fibrous roots, 6 

 to 15 inclies high, nearly terete, striate : spike ovate and obtusish to oblong an<I 

 acute, 2 to 5 lines long ; scales very numerous and densely crowded, ovate- oTjlong, 

 obtuse, brown with a paler margin, a line long : style 2-cleft : bristles 6 or 8, neariy 

 twice longer than the obovate lenticular shining nutlet, which has somewhat thick- 

 ened margins, the broad summit bearing a broadly deltoid tubercle. — Gray, Man- 

 ual, 558. 



In the Yosemite Valley (Bolandcr) ; Plumas County (Mrs. Ames) ; Oregon {Howell) ; Cascade 

 Mountains [Lyall) ; common in the Atlantic States from Canada to Florida. Referred by^oecke- 

 ler erroneously to the European E. ovata. It much resembles the last species, but is at once dis- 

 tingnislied by the nutlet. 



7. E. Bolanderi, Gray. Stems tufted, from rather thick rootstocks, very slen- 

 der, 3 to 10 inches high : spike oblong-ovate, acute, 2 or 3 lines long; scales dark 

 brown, ovate, obtuse, rather few, in 3 or 4 ranks : style 3-cleft : bristles 3 or 4, 

 unequal, very short, several times shorter than the nutlet, which is obtusely tri- 

 angular, oblong-obovate and compressed, with a short broadly deltoid tubercle. — 

 Proc. Amer. Acad. vii. 392. 



On stream-banks near Clark's, Mariposa County {Bolandcr), and in the Sierra Nevada near snow, 

 E. L. Greene. 



++ -H- Tubercle pyramidal-subulate, longer than broad. 



8. E. rostellata, Torr. Stems slender, compressed, strongly sulcate, 1 to 1\ 

 feet high, often rooting and proliferous at the apex : basal sheaths light-colored"': 

 spike oblong, 3 to 5 lines long, rather few-flowered ; scales light brown or straw- 

 color, ovate, obtuse, somewhat rigid and carinate, nearly 2 lines long : style 3-cleft : 

 bristles G, exceeding the obovate obtusely triangular nutlet, which is 1| lines long 

 including tlie stout narrowly pyramidal tubercle (half as long as the nutlet). 



Var. OCCidentalis. Xutlet narrower, oblong-obovate : bristles mostly shorter. 

 Near Fort Tcjon {Dr. Horn) and in San Bernardino County, Parry k Lcmmon, n. 398. The 

 tyi)ical form belongs to the Atlantic States. 



