702 CALIFORNIA ACADEMY OF SCIENCES. 



I can see no resemblance in this group of plants to 

 HeJianthella proper, but there is a strong likeness to En- 

 celia; in addition, the former genus is confined to the 

 cold mountains at high altitudes, while the latter is con- 

 fined to the dry and very hot regions at low elevations, or 

 when the elevations are above 5000° it is due to isolated 

 peaks or ridges in hot regions. To put this plant and its 

 congeners into Helianthella does violence to their generic 

 relationship as well as habitat. 



Encelia argo^hylla (Eaton) Gray. Tithonia argophylla 

 Eaton, Bot. King Exp. 



No. 5032q, April 10, 1894, at salt mine, in hard alka- 

 line clay, 10 miles above Stone's Ferry, Nevada, 1200° 

 alt. 



This appears to be exactly like the type of the species. 

 The scales seldom exceed the disk, ovate acuminate; 

 akenes very villous, cuneate-oblong, wings narrow, awns 

 stout and nearly as long as the corolla tube; rays about 

 i' long, 1-2" wide, hairy externally like all the other spe- 

 cies of this group; ray akenes abortive, triquetrous with 

 or without pappus (this character also belongs to the 

 group) ; stems very thick and tufted, branched and very 

 short, woody, densely covered with the very thick leaves ; 

 peduncles scape-like from the crown of the leaves, 2° 

 long. V 



Encelia grandiflora. Helianthella argophylla Co- 

 ville, Death Valley Rep., p. 132, not Gray, Proc. A. A. 

 xix, 9. 



This differs from the above in the glabrous or barely 

 pubescent not villous akene, which is deltoid, 3" long by 

 2" wide, with wing conspicuously developed and minute 

 awns; bracts lanceolate, long-acuminate, longer than the 

 disk, often 6" longer; rays 4" wide and i' long, heads 

 with the rays 5' wide. This is a much larger plant than 



