10 LBAFI^ETS. 



Here also I refer Hall & Harbour's n. 255, and other speci- 

 mens by later collectors. 



Pyrrocoma HOiyOLBucA. Small plants, 4 or 5 inches high, 

 many-stemmed, all the parts, even to the involucres, more or 

 less -whitened with a loose cottony or flocculent indument : 

 basal leaves lanceolate, acuminate, usually incise-serrate, some- 

 times quite entire : flowering stems many, slender, leafy- 

 bracted, in young plants apt to bear two or more heads, in the 

 more mature always monocephalous : heads low-hemispherical, 

 Yt, inch wide exclusive of the many and quite showy though 

 rather narrow rays ; bracts of the involucre in 3 series, of 

 herbaceous texture, densely white-lanuginous : achenes silvery- 

 silky, the hairs closely appressed. 



Yellowstone National Park, collected under the direction of 

 Dr. E. H. Mearns, 1902 ; special station not named. The 

 collector's numbers in U. S. Herb, are 3188, 3190, 3191 and 

 3191^. 



Pyrrocoma ampIvEctens. Stems 1 or 2 from the root, up- 

 right from a slightly decumbent base, a foot high or more, 

 monocephalous ; all parts glabrous except the stem near the 

 head of flowers : basal leaves narrow, linear-lanceolate, 5 to 8 

 inches long, rather obtuse, quite entire ; cauline of the same 

 form and large, 2 to 4 inches long, sessile and clasping the 

 stem : head distinctly broad-turbinate, an inch high and more, 

 quite as broad ; bracts of the involucre green -herbaceous ex- 

 cept at the very base, even of thinnish texture, oblong or oval, 

 obtuse, forming more than two series, but subequal and little 

 imbricated : rays large and showy, almost as in P. crocea. 



Mogollon Mountains, New Mexico, at 9,000 feet, O. B. Met- 

 calfe, 17 Aug., 1903. 



Pyrrocoma demissa. A robust dwarf, the herbage of sub- 

 coriaceous texture and glabrous : basal leaves seldom 2 inches 

 long, with very short-petiolar base, the blades oblong-lanceo- 

 late, acute, either entire or few- toothed, the teeth subserrate : 

 pedunculiform stems decumbent, leafy-bracted, monocepha- 



