222 CYPERACE.E. KUmhan.'^. 



E. OLIVACEA, Torr., with very sIi'IkKt tuftcil sjneading stems 1 to 6 inelies liigli, ovate or 

 ol)loiij,'-ovate spikes 1 to 3 lines loii^', ami a simiiar nutlet neuilva liaU'-line long Imt sliorter than 

 the 6 or 8 bristles, has been collerted in Colorado (Grcaic) and "Oregon (//"//), nnd will ])rotinlily 

 be also found in Northern Califoniia. The Oregon R])C(imen has shorter bristles than the eastern 

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



++ ++ Sti/le 3-cli'ft and nutlet tn'aiujulur. 



5. E. arenicola, Torr. Stems very slender, silicate, G to 18 incites high, from 

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

 extremity : hasal sheaths hrown, hecoming nearly black : spike ovate or usually ob- 

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

 thin, brown with greenish midvein and pale border : bristles 4 or (5, about etpialliiig 

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

 tubercle much broader tlian the apex of the nutlet, thick, deltoid, acute. — Tl. 

 Liudh. 29, and Hot. Mex. Bound. 228. A\ Dwibez/ami, lioeck. in Linn, xxxvi. 4r)0, 

 as to Drummond's plant. 



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

 Santa Barbara ( Roth ruck, \\. 58); I^os Angeles (AVt!/;t) ; '"uianiaca Mountains (/'((//ncr, ii. 380); 

 also collected by Coulter, n. 7i)9. It is common eastward from New Mexico ( J/ViV//;/, n. 1958, 

 10J9) to South Carolina and Florida, and is the E. En(]chnnnni of Hall's Te.xan collection (n. 69G), 

 but not of Steudel, which is a form of E. ohlusn. TJic Mexican E. tniuci/d, Schlecht. (E. vimi- 

 tana, Benth. PI. Hartw. 27), which Boeckeler also refers to tlie Peruvian E. Domheiinnn, Knnth, 

 is much like the ])resent species, but lias larger and less crowded scales, and a somewhat larger 

 and broader nutlet, with longer bristles. 



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



++ Tubercle flattened, broader than long. 



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

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

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

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

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

 ened margin.s, the broad summit bearing a broadly deltoiil tubercle. — Oray, Man- 

 ual, 558. 



In the Yoseniite Valley {Bolamlrr); Plumas County {Mrs. Ames) ; Oregon {IIowcU) ; Cascade 

 Mountains {Lyeill) ; common in the .\tlantic States from Canada to Florida. Referred by Boecke- 

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

 tinguished b}' the nutlet. 



7. E. Bolanderi, Oray. 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 olttusely 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 {Bolnnder), and in the Sierra Nevada near snow, 

 E. L. Greene. 



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



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

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

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

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

 bristles G, exceeiling the obovate obtu.sely triangular nutlet, which is \\ lines long 

 inchuling the stout mirrowly pyramidal tubercle (half as long as the nutlet). 



Yar. OCCidentalis. Nutlet narrower, oblong obovate : bristles mostly shorter. 

 Near Fort Tejon {l,>r. Horn) and in San Bernardino County, Parry k Lcmmon, n. 398. The 

 typical form belongs to the Atlantic States. 



