224 LEAFI^BTS. 



involucres subturbinate, more than V^ inch high, bracts nar- 

 row below, broader and obtuse above, light-green, notably 

 hirsutulous with jointed and viscid hairs : achenes with a con- 

 spicuous indument of stiff short strongly ascending hairs ; 

 paleae of the pappus very unequal, some of the outer very 

 short, the innermost greatly elongated. 



Point of Rocks, Wyoming, in dry soil, collected by E. D. 

 Merrill and E. N. Wilcox, 19 June, 1901. Specimens in 

 U. S. Herb. 



Chaenactis Evermannii. a low much branched and 

 decumbent undershrub, the branches rather slender, wiry, 

 hard-woody and tortuous, those of former seasons naked, 

 dark-brown, those of the season an inch or two long, closely 

 leafy, monocephalous, the small head on a short and slender 

 peduncle : leaves only /^ to ?^ inch long, some tridentate and 

 tapering cuneately to a short petiole, others between pedately 

 and pinnately 5-cleft or lobed, the lobes oblong, obtuse, en- 

 tire, the leaf as a whole white-tomentose on both faces when 

 young, glabrate in age : involucre small, turbinate, far shorter 

 than the flowers, of few and unequal bracts, all wholly herba- 

 ceous and very obtuse, thinly tomentose : achenes densely, 

 even somewhat silkily, appressed-pubescent ; pappus of about 

 8 unequal thin obtuse scales. 



Collected on a mountain in Idaho, in 1895, by Dr. B. W. 

 Evermann . 



Chaenactis brachiata. Perennial with stout lignescent 

 basal branching and the dimensions of the northern and genu- 

 ine C. achilleifolia, but basal leaves as well as cauline many 

 times smaller, more fleshy and very compact as well as per- 

 manently white-tomentose, the closely pinnate blades ovate 

 to oval, only ^ to 1 inch long on stout petioles of equal or 

 greater length : stems a foot high or more, whitened with 

 wool when young, the wool only partly persistent later, the 

 3 or 4 monocephalous branches brachiate, i. e. abruptly diver- 

 gent from the main stem at first, then holding the heads erect 



