958 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



2. Encelia frutescens A. Gray, Amer. Acad. Arts and Sci. Proc. 8: 

 657. 1873. 



Simsia frutescens A. Gray in Torr., U. S. and Mex. Bound. Bot. 



89. 1859. 



Grand Canyon (Coconino County) and Mohave County, to Graham, 

 Pima, and Yuma Counties, up to about 4,000 feet, common on rocky 

 slopes and mesas, March to September, type from Agua Caliente, 

 Maricopa County (Emory in 1846). Southern Utah to southern 

 California and Arizona. 



Key to the varieties 



1. Leaves not densely cinereous- or canescent-pubescent (2). 

 2. Leaves sparsely tuberculate-hispidulous with conical tuberculate-based 

 white hairs, not obviously glandular; peduncles not glandular; involucre 

 hispid, not or only slightly glandular; heads usually discoid. 



E. FRUTESCENS. 



2. Leaves tuberculate-hispidulous and also conspicuously glandular; peduncles 



more or less glandular; involucre densely glandular, sparsely hispidulous; 



heads radiate var. resinos a. 



I. Leaves cinereous- or canescent-pubescent; heads radiate (3). 



3. Leaves cinereous with fine appressed hairs, these intermixed with stouter, 



tuberculate-based, antrorse hairs var. virginensis. 



3. Leaves canescent or cinereous with fine soft appressed hairs, without longer 

 tuberculate-based hairs var. actoni. 



The var. resinosa M. E. Jones has been collected near Winslow 

 (type, Jones in 1890) and in Monument Valley (Navajo County), 

 and along the Little Colorado Kiver near Cameron (Coconino County), 

 4,300 to 5,300 feet. The var. virginensis (A. Nels.) Blake (E. virginen- 

 sis A. Nels.), occurs in Coconino, Mohave, Graham, Gila, Pinal, and 

 western Cochise Counties. The var. actoni (Elmer) Blake (E. 

 actoni Elmer) has been reported from western Arizona. 



Encelia californica Nutt. A collection of this species, purporting to be from 

 Fort Mohave (Cooper in 1860-61), has been the only basis for the recording of 

 this species from Arizona. As the plant has not been found by subsequent 

 collectors, and as it is definitely known only from coastal southern California 

 and the west coast of Baja California, it seems almost certain that the locality 

 given for this collection is incorrect. The species may be recognized by its 

 solitary heads, purple disk, and densely soft-pubescent involucre. The plant is 

 reported to cause severe dermatitis in susceptible persons. 



65. SIMSIA si 



Annual herb, pubescent, branched; leaves mostly opposite, ovate, 

 often toothed, petioled; heads numerous, panicled, medium-sized, 

 yellow, radiate; achenes obovate, compressed, very flat, glabrous, 

 epappose. 



1. Simsia exaristata A. Gray, PI. Wright. 2: 87. 1853. 



Encelia exaristata A. Gray in Hemsl., Biol. Cent. Amer. Bot. 2: 

 183. 1881. 



Near Tombstone, Cochise County, 4,500 feet (Peebles et al. 3377), 

 valleys, September and October. Western Texas to southeastern 

 Arizona and Mexico. 



81 Reference: Blake, S. F., a revision of encelia and some allied genera. Amer. Acad. Arts and 

 Sci. Proc. 49 (Gray Herbarium Contrib. 41) : 376-396. 1913. 



