532 



minutely scabrous; ligule scarions, acute, nbout 2 liucs long, decurrent; leaf blade' 

 Hat, 1 to '^ lines wide, those of tbo culm 1 to 3 incbcs long, those of the sterile shoots 

 G to 10 inches long, miduervc prominent beneath, smooth on both surfaces except 

 near the rigid acute tips, the distinctly cartilaginous margins scabrous. Taniclc 2 

 to 4 or 5 (usually about 3) inches long, the scabrous branches at Jirst nearly erect, 

 widely spreading in anthcsis; spikelets 3- to 5-llo\vered, 3 to 4 lines long, usually 

 much longer than the rough pedicels; empty glumes nearly equal, 3-nerved, broadly 

 lanceolate, acute with scarions margins and tips, the l<eel of the larger second glume 

 scabrous near the apex; llowering glumes oblong, obtuse, 5-nerved, with scarions 

 margins, silky-hairy on the nerves to near the middle and pubescent all over on the 

 dorsal surface near the base, minutely scabrous in the ujtper ])art; i)alea as long as 

 the glume, ciliate-scabrous on the keels, villous near the base. 



It has Ijeen doubtfully referred to /'. jyralcnsis. From this it differs in its hmger 

 and acute ligule, its hirger spikelets, and its less strongly compressed glumes, which 

 have broader scarious margins and no cobweb at the base. It resembles also,^ 

 somewhat, /'. alpina, but differs in its larger size, long, creeping rootstock, long, acute 

 ligule, and empty glumes not conspicuou.sly crested on the keel. 



Hot Springs, altitude 1,(150 m.. .June 13; Custer, altitude l,().">Om., .Inly 1(5 (Xo. 1151), 

 No. 1272 from the Sand Hills of central Nebraska is the same. It has also been col- 

 lected by .John Macoun at Cypress Hills, I>ritish America, in August, 1880, and l>y 

 Mrs. S. B. Walker at Castle Kock, Colo., in 1890, 



Poa pratensis L. Sp. PI, i, 67 (1753), 



A variable species, the extreme forms of which seem very dilVercnt from each othcv. 

 One form, very low and tufted with Aery narrow leaves and small spikelets. was found 

 near Lead City, altitude 1,(300 m,, .July 6 (No. 1153), A form 5 to 8 dm, high, with 

 broad and long leaves (15 to 20 cm, long and G mm. wide), and very largo spikelets 

 was collected at Hot Springs, altitude 1,050 m,, .June 13 (No, 115G), A similar one, 

 but with narrow panicle as in P. scvotina, Avas found iu Elk Canyon, altitude 1,200 m., 

 June 30 (No, 1157), These are perhaps distinct from V. pratensis. 



Poa nemoralis L, Sp, PI. i, 69 (1753). 



Several forms were collected, which have all been referred to this 8]>ecies by Pro- 

 fessor Scribner, One is a low plant approaching variety stricta, but having a more 

 open panicle. It resembles P. casia collected by Rushy in Arizona, Hot Springs, 

 altitude 1,0.50 m,, .lune 14 (No, 1155). A form that by several has been mistaken for 

 i'. 8(ro/iHrt was collected at Lead City, altitude 1,600 m., .Inly G; Custer, altitude 

 1,700 m,, August 1 (No. 11.58), It has stiff leaves and spreading panicle, P.scrotina 

 of C. C, Parry's collection and perhaps of Watson, King Survey collection, is the 

 same. Another form is like the last, but with smaller and light-colored s])ikelet8 

 and broader, more flaccid leaves. In a wet ]dace: Rapid City, altitude 1,000 m., 

 .Tune 25 (No, 11.59), A slender form with >si)reading panicle, small, light-green spike- 

 lets, and longer ])edicels was mistaken for P.ahuchs. Lead City, altitude 1,G00 ra., 

 July G (No. IIGO). 



Panicularia nervata (Willd.) Kuntze, Kev. (leu, PI. ii, 783 (1891); Poa uerrata 

 Willd. Sp. PI. 1,389(1798). 



In wet meadows: Whitewood. altitu<le 1,100 m,, .Inly 7 (No, llGl), 



Panicularia americana (Torr.) MacMillan, Metasj). Minn. A'al, 81 (1892); Poa 

 aqiiatica amerlrana Torr. Fl. U. S. i, 108 (1824), 



In i)onds, above Custer, altitude 1,0.50 m., July 16 (No. 1163), 



Festuca oviiia 1.. Sp. PI. i. 73 (1753) var. 



The 8i>e<imens are low, with a narrow panicle. an:l short, narrow leaves. It 

 resenddes the \arU'.ty j^sejido-oritui Hack. It grows in bunches on dry prairie. Lead 

 City, altitude 1,600 m., July 4 (No. 1104), 



( 



