65 



KEY TO GENERA. 



VERNONIACEiE. 



Pappus a small, fleshy, entire ring. 

 Pappus bristle-shaped. 



Ethulia. 

 Vernonia. 



EUPATORIACE^. 



Heads 4-flowered. Pappus of many slender bristles. 

 Heads many-flowered. Pappus of 5-10 broad, 



toothed scales. 

 Heads many-flowered, 

 bristles. 



Pappus of 3-5 gland-tipped 



ASTEROIDE^. 



Heads conspicuously radiate, rays never yellow. 

 Heads conspicuously radiate, rays yellow. Pappus 



bristly, l-seriate. 

 Heads either discoid or imperfectly radiate, marginal 

 florets filiform with imperfect rays. Pappus 

 single, bristle-shaped. 

 Heads discoid, all florets tubular and perfect. 

 1 Pappus bristles rough, in 2 or more series. 

 1 Pappus bristles rough, in 1 series. 



1 All florets without pappus. Leaves pinnatifid. 

 2 Rays white, disk yellow. Erect. Jnvolucral bracts 



sub-2-seriate 

 2 Rays and disk yellow. Erect. Involucral bracts 



sub-2-seriate. 

 2 Rays and disk yellow. Climber. Involucral 



bracts in several rows. 

 2 Marginal florets in a single row. Leaves heath-like. 

 2 Marginal florets in many rows. Anthers not 



tailed Receptacle flattish. 

 2 Marginal florets in many rows. Anthers not 



tailed. Receptacle conical. 

 3 Pappus uniseriate, deciduous. 

 3 Pappus in 2-3 series, persistent. 



INULOIDE^. 



Heads discoid, dioecious. 



Heads androgynous. 



Heads androgynous or homogamous. 



Heads heterogamous or homogamous. 



1 Achenes woolly. Pappus none. 



1 Achenes pubescent. Pappus copious, setose. 



2 Pappus bristle-shaped, copious. Anthers tailed. 

 2 Pappus bristle-shaped, copious. Anthers not 



tailed. 



MlKANIA. 



ACxERATUM: 



Adenostemma. 



NiDORELLA. 



Aster. 



Felicia. 



Garuleuaf. 



Erigbron. 



XlDORELLA. 



MiCROGLOSSA. 

 NOLLETIA. 



CONYZA. 



DiCHROCEPHALA. 

 CHRYgOCOMA. 



Heteromma. 



Tarchoxanthus. 

 Brachyltena. 



BLDAfEA. 



Laggera. 



