1907] Hall. Compositae of Southern California. 133 



48. ENCELIA Adans. 



Herbs and low shrubs confined to the western part of North 

 and South America. Leaves 3-nerved from the base, entire or 

 remotely toothed. Heads on nearly naked peduncles, ours with 

 showy yellow rays and yellow or purple disk. Kay-flowers neu- 

 tral. Disk-achenes flat, in our species obovate or cuneate and 

 with conspicuously ciliate margins, the sides either smooth or 

 pubescent in the same species. Pappus none, or of 1 or 2 slender 

 awns in some species. 



SYNOPSIS OF THE SPECIES. 

 Perennials, the stems woody at least below. 



Peduncles pubescent: heads solitary, terminating elongated simple 



branchlets which are leafy or bracteate below. 



Involucre densely white-villous, 10 to 15 mm. high: rays 1.5 to 3 

 cm. long: disk purple, the corolla-lobes either pubescent or 



glabrous: leaves green 1. E. Calif ornica. 



Involucre canescent, 5 to 10 mm. high : rays 1 to 1.5 cm. long or 

 none: disk yellow, the corolla-lobes pubescent: leaves green 



to white-tomentose 2. E. frutescens. 



Peduncles smooth, glabrous: heads in cymes, the ultimate branches 

 (peduncles) of which are relatively short and naked: involucre 

 sparsely pubescent, 5 to 8 mm. high: rays 1 to 1.5 cm. long: disk 



yellow, the corolla-lobes glabrous: leaves white-tomentose 



3. E. farinosa. 



Annual or biennial herbs (root of no. 5 unknown). 



Heads radiate: involucral bracts acuminate, white-setose 



4. E. eriocephala. 



Heads discoid: involucral bracts obtuse or merely acute, viscid 



.....5. E. viscida. 



1. E. Californica Nutt, Trans. Am. Philos. Soc. ser. 2, vii. 

 357 (1841). 



Slender spreading stems 6 to 10 dm. high, shrubby only below, 

 usually growing in clumps of considerable size : leaves ovate to 

 lanceolate, acute, 2 to 6 cm. long, narrowed to the petiole, green, 

 minutely scabrous or glabrate : heads solitary, terminating elong- 

 ated nearly naked pubescent peduncles : involucre densely white- 

 villous, 10 to 15 mm. high : rays 16 to 30, 1.5 to 3 cm. long : 

 disk purple, 1.5 to 2.5 cm. broad: corolla-lobes either smooth or 

 pubescent. 



