1560 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM 



Leaves laciniately lobed. 



Leaves with linear rachis and lobes 1. E. ventorum. 



Leaves ovate or obovate in outline, the lobes lanceolate 2. E. laciniata. 



Leaves entire or toothed. 



Leaves linear or linear-filiform 8. E. stenophylla. 



Leaves oblong to ovate. 



Heads numerous, panicled; peduncles and pedicels glabrous, rarely with a 



few hairs 3. E. farinosa. 



Heads few or solitary; peduncles pubescent. 



Disk yellow 4. E. albescens. 



Disk purple or brownish purple. 



Phyllaries densely pubescent on back as well as on margin. 



5. E. californica. 

 Phyllaries conspicuously ciliate, on back glabrous to rather sparsely 

 hispidulous or pubescent. 

 Leaves cinereous-pubescent, usually cordate or subcordate at base. 



6. E. palmeri. 

 Leaves green, cuneate to truncate at base 7. E. halimifolia. 



1. Encelia ventorum T. S. Brandeg. Proc. Calif. Acad. II. 2: 175. 1889. 

 Baja Californica; type from Boca de las Animas. 



Shrub about 1 meter high, much branched; leaves 3 to 6.5 cm. long, fleshy, 

 the rachis and the 1 to 5 lobes linear, 1 to 2 mm. wide; heads about 1.7 cm. 

 wide, nodding, fragrant, resinous. 



2. Encelia laciniata Vasey & Rose, Proc. U. S. Nat. Mus. 11: 535. 1889. 

 Baja California; type from Lagoon Head. 



Shrubby, 60 to 90 cm. high, usually hispid; leaves 3 to 5.5 cm. long, ovate or 

 obovate in outline, unequally laciniate-lobed, the lamina 2.5 to 6 mm. wide 

 between the lobes. 



3. Encelia farinosa A. Gray in Emory, Mil. Reconn. 143. 1848. 



Sonora and Sinaloa. Nevada to California and Arizona; type from California. 



Shrubby below, 1.6 meters high or less, resinous; stem white-farinose, glabres- 

 cent; leaf blades broadly ovate to lanceolate, 3 to 10 cm. long, entire or subentire, 

 white-farinose, sometimes glabrescent; heads about 2.5 cm. wide; disk yellow. 

 "Hierba ceniza" (Sinaloa); "incienso" (Baja California); "palo bianco," 

 "hierba de las dnimas" (Sonora); "hierba del bazo" (Arizona). 



The shrub is very abundant in some parts of Sonora, and is gathered for use 

 as firewood. A resin obtained from the stems is sometimes used as incense in 

 churches. The plant has sometimes been mistaken for guayule (Parthenium 

 argeniatum) . The Indians chewed the gum and used it as a varnish for arrows 

 and other objects. The gum also was melted and smeared on the body as a 

 relief for pain in the sides. 

 3a. Encelia farinosa phenicodonta Blake, Proc. Amer. Acad. 49: 362. 1913. 



Baja California and Sonora; type from San Quintfn, Baja California. Cali- 

 fornia and Arizona. 



Disk purple; otherwise as in the typical form. "Incienso" (Baja California). 



The resin is burned for incense in the churches of Baja California. 

 3b. Encelia farinosa radians T. S. Brandeg.; Blake, Proc. Amer. Acad. 49: 

 362. 1913. 



Encelia radians T. S. Brandeg. Proc. Calif. Acad. II. 2: 176. 1889. 



Cape region of Baja California; type from San Gregorio. 



Leaves soon glabrate; involucre essentially glabrous; disk purple. 



4. Encelia albescens A. Gray, Proc. Amer. Acad. 8: 658. 1873. 

 Known only from the type locality, somewhere in Sonora. 



