ASTERACEAE. 



357 



Style-branches not stigmatic to 

 the summit. 

 Style-branches stigmatic 

 only below the middle; 

 flowers never yellow ; rays 

 none. 

 Style-branches of the per- 

 fect flowers stigmatic to 

 or above the middle, the 

 upper sterile portion 

 forming a flattened ap- 

 pendage. 

 Style-branches stigmatic up to 

 the truncate apex. 

 Bracts herbaceous; herbage 



not aromatic. 

 Bracts with scarious mar- 

 gins; herbage aromatic or 

 strong-scented. 

 Bracts usually in 1 series; pappus 

 generally capillary. 

 Receptacle not naked. 

 Receptacle fimbrillate. 

 Receptacle chaffy. 



Bracts of the involucre not 

 scarious. 

 Bracts of the involucre in a 

 single series, more or less 

 enclosing the ray-achenes. 

 Bracts of the involucre in 2 

 or more series not enfold- 

 ing the ray-achenes. 

 Bracts of the involucre scarious, 

 at least on the margins. 

 Anthers caudate at base. 



Anthers not appendaged at apex; in- 

 volucre usually scarious. 

 Anthers appendaged at apex; bracts 

 usually spinescent. 

 Corollas regular, all tubular.^ 

 Corollas 2-lipped; rays wanting. 

 Heads composed of ligulate flowers only. 

 Heads of 2 kinds: staminate heads clustered 

 above the pistillate, anthers more or less free; 

 pistillate heads few-flowered, flowers com- 

 pletely enclosed in the prickly involucre. 



1. EUPATORIEAE. 



2. ASTEREAE. 



7. Helenieae. 



Anthemideae. 

 Senecioneae. 

 Helenieae. 



6. Madieae. 



5. Heliantheae. 

 8. Anthemideae. 



3. Inuleae. 



Cynareae. 

 mutisieae. 



CiCHORIEAE. 



4. Ambrosieae. 



Tribe 1. EUPATORIEAE. Eupatory Tribe. 



Ours herbs or suffrutescent plants with white or flesh- 

 colored perfect disk-flowers and no rays. Receptacle 



