924 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



10. Plants comparatively coarse, large-leaved, and large-headed; stems 

 usually more than 30 cm. high; disk of the head more than 1 cm. 

 wide; middle stem leaves usually more than 5 mm. wide (11). 

 11. Stem very leafy to the inflorescence, the upper leaves not much 

 reduced; heads usually several, the peduncles not elongate (12). 

 12. Stem glabrous or sometimes sparsely pilose above, not glandular. 



2. E. MACRANTHUS. 



12. Stem densely and finely glandular-puberulent. at least above, often 



also spreading-hirsute (13). 



13. Stem usually rather densely spreading-hirsute as well as glanduiar- 



puberulent; stem leaves usually densely ciliate. 3. E. patens. 



13. Stem densely and finely glandular-puberulent, at least above the 



middle, essentially without long hairs; stem leaves not or only 



very sparsely ciliate 4. E. superbus. 



11. Stem more or less naked above, the upper leaves strongly reduced; 

 heads mostly 1 to 3, on comparatively long, mostly naked peduncles 

 (14). 



14. Rays violet or purple 8. E. pecosensis. 



14. Rays white or pink (15). 



15. Plant very sparsely hairy or nearly glabrous (16). 



16. Stem leaves not ciliate; stem densely and finely glandular- 

 puberulent above, with very few long hairs or none. 



4. E. superbus. 



16. Stem leaves ciliate; stem near the apex (the peduncle) spreading- 



pilose, essentially without glandular hairs__ 5. E. kuschei. 

 15. Plant rather densely hairy (17). 



17. Plant green, the pubescence usually appressed, at least on the 



upper part of the stem; pappus nearly simple, the outer series 



inconspicuous 6. E. rusbyi. 



17. Plant cinereous-pilose with spreading hairs; pappus distinctly 

 double, the outer series setulose-squamulose. 



7. E. ARTZONICUS. 



10. Plants comparatively slender, small-leaved, and small-headed; stems 

 usually less than 30 cm. high; disk of the head less than 1 cm. wide; 

 middle stem leaves less than 5 mm. wide (18). 

 18. Leaves twice ternatety divided into linear or spatulate lobes; plant 

 essentially scapose, dwarf, 10 cm. high or less_ll. PJ. compositus. 

 18. Leaves entire or rarely toothed, lobed, or pinnatifid, never ternately 

 divided; stems usually leafy (19). 

 19. Stem pubescent with wide-spreading or sometimes deflexed hairs 

 (20). 

 20. Stems diffuse; leaves (some of them, particularly on the sterile 

 branches) often pinnatifid, with 1 to 3 pairs of lobes; peduncles 

 short (usually 2.5 cm. long or less) ; leaves small, 2 cm. long 



or less, the entire ones spatulate to linear 19. E. lemmoni. 



20. Stems (at least the first flowering stem) erect or suberect; leaves 



entire or sometimes toothed or pinnatifid (regularly so in E. 



lobatus, very rarely in E. divergens and E. nudiflorus) , usually 



longer (21). 



21. Plant scapose, dwarf, not more than 10 cm. high; leaves all 



basal, spatulate, ciliate, otherwise essentially glabrous; plant 



high-montane 1. E. simplex. 



21. Plants leafv-stemmed, normallv taller; leaves pubescent on the 

 faces (22). 

 22. Flowering stems at first scapiform, eventually producing long, 

 spreading, leafy, usually sterile branches from the lower 



axils 21. E. NUDIFLORUS. 



22. Flowering stems usually leafy from the start, not producing 



long spreading leafy sterile branches from the lower axils 



(23). 



23. Leaves (the lower and usually also the middle leaves) 



obovate in outline, pinnatifid with (3) 5 to 7 lobes; 



stem glandular-puberulous, at least above, as well as 



rather sparsely spreading-pildse 24. E. lobatus. 



