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COMPOSITES FROM OREGON. 19 



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without the rays ; outer bracts of involucre foliaceous, exceed- 

 ing the rays, inner successively smaller, all linear-lanceolate, 

 acute, entire, ciliate with soft viscid hairs. 



Collected somewhere in the Territory of Washington, by 

 G. R. Vasey, in 1889; sheets 296812 and 296811 of U. S. 

 Herb., the former, monocephalous, the latter with 3 or 4 heads 

 and these smaller. 



Pyrrocoma pratensis. Stems clustered, erect, more than 

 a foot high, notably leafy to the summit ; basal leaves on firm 

 petioles that are upright and longer than the lanceolate acumi- 

 nate blades ; cauline spatulate-lanceolate, sessile, all of a light- 

 green but not yellowish hue, all saliently and pungently ser- 

 rate-toothed, the pubescence scanty a,nd villous without vis- 

 cosity, the herb appearing glabrous to the unaided eye : heads 

 1 to 3 and subsessile, low-hemispherical, an inch broad with- 

 out the rays; bracts in few series and little imbricated, the 

 outer foliaceous, almost linear, very acute, far surpassing the 

 inner, all whitish-hairy at base. 



Dry field, in southwest corner of Camass Prairie, Idaho, 14 

 July, 1895, tf. F. Henderson, his n. 3113 as inU. S. Herb. 



Pyrrocoma scaberula. Stems several, upright, rather 

 slender, 2 feet high, monocephalous, stiffly or almost hispidly 

 short-hirsute : basal leaves 5 to 7 inches long, the blades ex- 

 actly lanceolate, entire, scabro-hirtellous on both faces and 

 much reticulate, of firm texture yet thinnish, the petioles nar- 

 row, not elongated ; cauline few, lance-linear, sessile : invol- 

 cres an inch broad, % inch high, their bracts large, moder- 

 ately imbricated, not numerous, spatulate-lanceolate, acute, 

 scabrous-ciliolate : rays not very conspicuous. 



Nez Perces Co., Idaho, 1896, A. A. Heller, his n. 3469, 

 sent out for P. integrifolia , but most unlike that every way. 



Pyrrocoma sericea. Stems few, firm but not stout, as- 

 cending, 3 to 5 inches, loosely white-woolly as also the small 

 sessile cauline leaves ; basal leaves lanceolate, very acute, entire 

 or with few and remote very salient teeth, white on both faces 

 with a long soft and almost silky wool ; heads mostly solitary 



