WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 619 



Pappua not plumoBe. 



Pappus, at least in part, of scales, or these reduced 



and united into a crown. 



Involucre simple, that is, with no short calycu- 



late outer bracts; outer pappus of minute 



scales scarcely visible except under a 



strong lens; flowers yellow 4. Cynthia (p. 621). 



Involucre with few or many calyculate outer 

 bracts; outer series of pappus conspicuous; 

 flowers yellow or blue. 



Flowers blue; plants caulescent 5. Cichorium (p. 622). 



Flowers yellow; plants acaulescent 6. Ueopappus (p. 622). 



Pappus of capillary bristles. 

 Achenes flattened. 



Achenes narrowed at the top or beaked; pap- 

 pus bristles falling separately; invo- 

 lucres cylindric 7. Lactuca (p. 622). 



Achenes truncate ; pappus bristles not falling 



separately; involucres campanulate.. 8. Sonchus (p. 623). 

 Achenes not flattened. 



Pappus bristles promptly deciduous, usually 



together 9. Malacothrix (p. 624). 



Pappus persistent or tardily deciduous. 

 Achenes with distinct slender beaks. 



Plant caulescent; pappus tawny 10. Sitilias (p. 624). 



Plants scapose; pappua white or 

 nearly so. 

 Achenes 10-ribbed or nerved; 

 not spinose-muricate; in- 

 volucres more or less im- 

 bricated 11. Agoseris (p. 624). 



Achenes 4 or 5-ribbed ; muricate- 

 spinulose, at least near 

 the apex; involucre of a 

 single series of equal in- 

 ner bracts with some ca- 

 lyculate outer ones 12. Taraxacum (p. 626). 



Achenes not beaked. 



Flowers rose-colored, never yellow. 

 Receptacle bearing capillary 



bristles 13. Calycoseris (p. 627). 



Receptacle naked. 



Pappus scabrous; heads 15 

 to 20-flowered; cau- 

 line leaves not scale- 

 like. One species 



of 14. HiERACIUM (p. 627). 



Pappus not scabrous; heads 

 3 to 12-flowered; cau- 

 line leaves scalelike 

 or none 15. Lygodesmia (p. 628). 



