ASTERACEAE: CICHORIEAE 193 



3. Centaurea. 1034. 



Bracts fimbriate, not ending in stip spines. 1. C. cyanus. 



Bracts ending in stiff spines. 2. C. solstitialis. 



1. Centaurea cyanus L. 

 Cultivated and sometimes escapes. 



2. Centaurea solstitialis L. 

 Introduced, but rare. Crete; Davey. 



Tribe 11. CICHORIEAE. 



Pappus of small scales, much shorter than the achenes, flowers blue 

 or white. 1. Cichorium. 



Pappus of bristles at least as long as the body of the achene. 

 Stems leafy or with several flowers. 

 Heads 5-10 flowered, flowers pink or purple. 



Lower leaves runcinate pinnatifid. 2. Ptiloria. 



All the leaves entire, the upper often reduced to scales. 



8. Lygodesmla. 

 Heads many flowered or the flowers yellow. 



Achene and pappus 7-8 cm. long. 3. Tragopogon. 



Achene and pappus much shorter. 



Flowers blue. 7. Lactuca. 



Flowers yellow, orange or red. 



Achenes distinctly beaked. 7. Lactuca. 



Achenes not beaked. 



Inflorescence not a spike-like thyrsus, heads usually many 

 flowered. 

 Achenes flattened; stem leaves auriculate-clasping. 



6. Sonchus. 

 Achenes terete or prismatic; stem leaves not auricu- 

 late-clasping. 

 Involucral bracts with scarious margins; receptacle 

 slightly bristly. 4. Malacothrix. 



Involucral bracts not scarious margined; receptacle 

 naked. 

 Pappus soft, white; achenes usually narrowed 

 above. ' 11. Crepis. 



Pappus of stiff, brown or brownish bristles; achenes 

 not narrowed above. 12. Hieracium. 



Inflorescence in our species a spike-like thyrsus; heads 

 12-16 flowered. 13. Nabalus. 



Acaulescent plants; scapes 1-flowered. 

 Leaves mostly entire. 

 Achenes 8-12 mm. long, scapes smooth, longer than the leaves. 



9. Agoseris. 



Achenes about 6 mm. long, scapes tomentose, at least above, 



equal to or shorter than the leaves. 10. Nothocalais. 



Leaves pinnatifid or sinuate-dentate. 5. Taraxicum. 



1. Cichorium. 890. 

 Heads sessile in clusters. 1. C. intybus. 



