WOOTON AND STANDLEY FLORA OF NEW MEXICO. 675 



Plants 30 cm. high or more, corymbosely 

 branched at the middle or above, stout; 



stems coarsely striate 13. E. bellidiastrum. 



Plants low, 10 to 14 cm. high, diffusely 

 branched from or near the base, slender; 



stems smooth 14. E. eastvoodiae. 



Pubescence spreading. 



Stems simple below 15. E. wootoni. 



Stems branched from the base. 



Rays white; stems spreading 16. E. arenarius. 



Rays purplish; stems erect or ascending 17. E. divergens. 



Perennials. 

 Leaves dissected or deeply cleft. 

 Rays purple; stems low, less than 10 cm. high, seapi- 



form 18. E. pinnatisectus. 



Rays white or pinkish; stems tall, not scapiform. . .19. E. rieomexicanus . 

 Leaves entire or slightly toothed. 



Stems low, less than 20 cm. high, scapiform, usually 

 bearing a single head. 

 Involucres and peduncles long-villous. 



Involucres and peduncles with black purple 



hairs 20. E. melanocephalus. 



Involucres and peduncles white-hairy. 

 Plants 5 to 8 cm. high; disk 10 to 12 mm. 



broad 21. E. uniflorus. 



Plants 10 cm. high or more; disk 13 to 15 mm. 



wide 22. E. leucotrichus. 



Involucres and peduncles hirsute to gland ular- 

 puberulent or glabrate, never long-villous. 

 Leaves and stems glabrous or nearly so; leaves 



spatulate 23. E. leiomerus. 



Leaves and stems pubescent; leaves much nar- 

 rower. 



Heads 12 to 13 mm. high 24. E. graiji. 



Heads 6 mm. high or less. 



Leaves linear-filiform; pubescence of the 



stems appressed 25 . E. nematophi/llus. 



Leaves linear ;pubscence of stems spreading. 26. E. vetensis. 

 Stems taller, 20 to 100 cm. high, usually with several 

 to numerous heads, not scapiform. 

 Stems densely cespitose from a thick tap-root; 

 heads small, i he disk usually less than 1 cm. 

 wide. 



Rays wanting 27. E. aphanactis. 



Rays present. 



Pappus double; stems hirsute 28. E. concinnus. 



Pappus uniseriate; stems strigose 29. E. eatoni. 



Stems usually solitary from the ends of simple or 

 branched rootetocks; heads larger, the disk 

 usually more than 1 cm. wide. 

 Bracts loose, with reflexed tips; rays broad; pap- 

 pus uniseriate. 



Bracts villous: rays white 30. E. COuUeri. 



Bracts glandular-puberulent; rays purplish. .31. E. aahtigirumu. 



