302 PROCEEDINGS OF THE A.AIERKAX ACADEMY. 



1903, Jones (X). Sonora: common on plains from Huerigo to 

 Granada, Guasabas, alt. 915-1220 m., 15 Nov. 1890, Hartman 233 

 (GN); Hermosillo, 10 June 1897, F. S. Malthij 229 (N); Torres, 10 

 June 1897, Malihy 179 (X); El Grupo (?), 13 Xov. 1895, McGee (X); 

 hillsides, Guaymas, July 1887, Palmer 111 part (GX'^); Hermasillo, 

 4 Mar. 1910, Rose, Standley, & Russell 12354 (X); Empalme, 11 Mar. 

 1910, Rose, Standley, & Russell 12625 (N); Carral, 12 Mar. 1910, Rose, 

 Standley, & Russell 12651 (X); Guaymas, 23 Apr. 1910, Rose, Stand- 

 ley, & Russell 15051 (N); Magdalena, 25 Apr. 1910, Rose, Standley, & 

 Russell 15098 (X); Sinaloa: thickets along Rio Fuerte, San Bias, 24 

 Mar. 1910, Rose, Standley, & Russell 13365 (X). — The only Encelia 

 of any economic importance, and that but slight, the resin being 

 burned as incense in the churches of Lo^Yer California, giving the 

 plant the local name of "Incienso" (Brandegee, Zoe i. 83 (1890)). 



3/3. E. farixosa Gray f. phenicodonta Blake, n. forma, disco 

 purpureo. Disk-corollas purple above; otherwise as in the typical 

 form. — Specimens examined: California: Riverside Mt., Newberry 

 (G) ; Arizona: Williams Fork, Mar. 1876, Palmer 251 (FX). Lower 

 California: west side of Lake Maquata, Colorado Desert, 27 Jan. 

 1890, Orcutt 2023 (X) ; canon near San Quentin, 22 Apr. 1886, Orcutf 

 1341 (cOTYPES in FGX'); old diggings, Calmalli, alt. 366 m., Jan.- 

 Mar. 1898, Purpus 33 (FX); La Paz, 20 Jan.-5 Feb. 1890, Palmer 

 50 (X); Santa Rosalia, 24 Feb.-3 Mar. 1889, Palmer 186 (GX); 

 Sonora: Papago Tanks, Pinacate Mts., 14 X'ov. 1907, MacDougal 

 (N); hillsides, Guaymas, July 1887, Palmer 111 in part (GX). 



37. E. farinosa Gray var. radians Brandeg. in herb., n. comb. — 

 Leaves glabrate or nearly so; in\olucre nearly or quite glal)rous, its 

 bracts chiefly linear-oblong; disk purple. 



Encelia radians Brandeg. Proc. Calif. Acad. ser. 2. ii. 176 (1889). 



Specimens examined: Lower California: San Jose del Cabo, 

 Mar.-June 1897, Anthony 4SS (GX); same locality, Jan. -Mar. 1901, 

 Purpus 398 (GX). 



-t— -t- Heads few or solitary' ; peduncles usually pubescent ; stem leafy. 

 ++ Shrubby, even the branches woody; heads solitary at tips of long naked 

 usually scabrous peduncles terminating the branches, often discoid; disk 

 yellow; a'wns often present. 



4. E. FRUTESCENS Gray.^^ A low much branched slu'ub, 1.3- 

 1.6 m. high, white with a dense short very scabrous pubescence at least 



35 Often confused with Viguiera Parishii Greene, which is rather similar 

 in aspect but has mostly opposite cordate-deltoid leaves and a pappus of 

 squamellae as well as awns. 



