222 CYPERACE^E. Eleocharis. 



E. OLIVACKA, Torr., with very slender tufted spreading stems 1 to 6 inches high, ovate or 

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

 the 6 or 8 bristles, has been collected in Colorado (Greene) and Oregon (Half), and will probably 

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

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



H- -H- Style 3-cleft and nutlet triangular. 



5. E. arenicola, Torr. Stems very slender, sulcate, 6 to 18 inches high, 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 6, about equalling 

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

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

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

 as to Druinmond's plant. 



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

 Santa Barbara (Rothrock, n. 58) ; Los Angeles (Nevin) ; Cuiamaca Mountains (Palmer, n. 386) ; 

 also collected by Coulter, n. 799. It is common eastward from New Mexico (Wright, 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 E. obf.usa. The Mexican E. fruncvta, Schlecht. (E. mcm.- 

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

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

 and broader nutlet, with longer bristles. 



t- *- Tubercle continuous with the nutlet and not at all constricted at base. 

 H- Tubercle flattened, broader than tony. 



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

 to 15 inches high, nearly terete, striate : spike ovate and obtusish to oblong and 

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

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

 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 (Bolander) ; Plumas County (Mrs. Ames) ; Oregon (HowelT) ; Cascade 

 Mountains (Lyall) ; common in the Atlantic States from Canada to Florida. Referred by Boecke- 

 ler erroneous!)' to the European E. ovata. It much resembles the last species, but is at once dis- 

 tinguished 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 obtiisely 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 (Bolaiidcr), and in the Sierra Nevada near snow, 

 E. L. Grceiie. 



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



8. E. rostellata, Torr. Stems slender, compressed, strongly sulcate, 1 to 2J 

 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 6, exceeding the obovate obtusely triangular nutlet, which is 1^ lines long 

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



Var. occidentalis. Nutlet narrower, oblong-obovate : bristles mostly shorter. 



Near Fort Tejon (Dr. Horn) and in San Bernardino County, Parry & Lcmmon, u. 398. The 

 typical form belongs to the Atlantic States. 



