r>80 



POACK.K. 



mm. wide, apex abruptly pointed, tliosc of the cnlm 2 in number, 

 0.5-5 cm. l«»Uf;. I'auiclo erect, rarely sprendiuj,'. 5-15 em. lon;^, 

 rays in twos or threes. Si)ikelets ratlier llrm, 5-S mm. lon<r, '*~b- 

 (mostly [?-) (lowered, pubeseeut, elliptieal-latieeolate, joint of 

 rachilla 1-1.5 mm. louii;; empty jjlunu's obtusely keeled, ."{-nerved 

 near the base, first linear-lanceolate, about '.\ nun. lonj^'. second el- 

 liptical-lanceolate, alutut 4 mm. lon<r; lloral ulume ;?.5-4."> mm. 

 Un\*f, elliptical or linear-oblont;;, aeute or obtuse, entire or erose. 

 bluntly keeled or almost round on the back, pubescent on the lower 

 third, puberulent above: palca linear, '^'-toothed. '.]Ji mm. loiiijf, mi- 

 nutely scabrous on the buck and keels. 



Dr. \'asey, al'ter prolonj^ed study of lar<;e nundiers of a])ecimeus. 

 found them very variable and perjdexinp^, and says in Coult, iiot. 

 Gaz. (»:•.'!): (18S1): '"It nuiy well be conjectured that Nature is 

 now eniiUii'ed in the work of dilTerentiation, and that in process of 

 time the lines will beconu! more sharply delined, and several new 

 species establislu'd.'" 



Montana, Scrihiirr ;!!•(;, and for L\ *b'. JJi'pf. J(/n'cul. G70, 

 Tirci'di/ iuVl, {)'S'7 : ()re<i-on, llonrU. 

 l{ocky j\lou!itains to Califorida. 

 Var. stenophyla \'asey. ined. 



Panicle slender, o])en, first _i>lume 4 mm. lonpf. second 5 mm. 

 loni;-; floral sjjbnne 5 mm. louij; the latter 

 minuti'ly scabrid below or smooth; palea 4.7 

 mm. long. 



Oretron, IToircll in ISSi. 

 ]\Iontana, Orej^on, and Califorida. 

 15. A. Canbyi (Scribn.). (lljurria Cahhyi 

 Soribn. Hull. Torr. i'hxh, 10:7:. /. (IHs;]). 



An erect snu)oth stout ])erennial. (i()-lt() 

 em, high, culms simple. Sheaths shorter 

 F\Q. W^.—Atropis Can- than the internodes; ligule broad, obtuse. 4-('> 



6v/ Spiia-lets. (Sciil)- , |^, blades of the culm :]-4 in num- 

 ner.) '^ 



ber, flat below, eonduplicate above, scabrous, 



the upper about 15 cm. long, 4-0 cm. wide. l*aiuele exscrted, 



linear or lanceolate, usmiUy interrupted below, about 15 cm. long, 



