390 Eupatorieae 



KEY TO THE TRIBES. 



Heads all alike, composed of both ray- and disk-flowers or of disk-flowers only. 

 Anthers not caudate at base. 

 Receptacle naked. 



Bracts of the involucre well-imbricated. 



Style-branches stigmatic only below the middle; flowers never 

 yellow; rays none. l. EDPATORIEAE. 



Style-branches of the perfect flowers stigmatic to or above the 

 middle, the upper sterile portion forming a flattened ap- 

 pendage. 2. ASTEBEAE. 

 Style -branches stigmatic up to the truncate apex. 



Bracts herbaceous ; herbage not aromatic. 7. HELENIEAE. 

 Bracts with soarious margins; herbage aromatic or strong- 

 scented. 8. ANTHEMIDEAE. 

 Bracts usually in 1 series; pappus generally capillary. 



9. SENECIONEAE. 



Receptacle fimbrillate. 7. HELENIEAE. 



Receptacle chaffy. 



Bracts of the involucre not scarious. 



Bracts of the involucre in a single series, more or less enclosing 



the ray-achenes. 6. MADIEAB. 



Bracts of the involucre in 2 or more series not enfolding the ray- 

 achenes. 5. HELIANTHEAE. 

 Bracts of the involucre scarious, at least on the margins. 



8. ANTHEMIDEAE. 

 Anthers caudate at base. 



Anthers not appendaged at apex; involucre usually scarious. 



3. INULEAE. 



Anthers appendaged at apex; bracts usually spinescent. 



Corollas regular, all tubular. 10. CYNAREAE. 



Corollas 2-lipped; rays wanting. 11. MDTISIEAE. 



Heads of 2 kinds : staminate heads clustered above the pistillate, anthers 

 more or less free ; pistillate heads few-flowered, flowers completely 

 enclosed in the prickly involucre. 4. AMBROSIEAE. 



Heads all alike, composed of ligulate flowers only. 12. CICHORIEAE. 



Tribe 1. EUPATORIEAE. EUPATORY TRIBE. 



Ours herbs or suffrutescent plants with white or flesh- 

 colored perfect disk-flowers and no rays. Receptacle 

 naked. Anthers not caudate at base. Style-branches 

 stigmatic only below the middle. 



Achenes 5-angled. 1. EUPATORIUM. 



Achenes 10-ribbed. 2. COLEOSANTHUS. 



1. EUPATORIUM L. 



Erect mostly branching perennial herbs, with opposite 

 verticillate or alternate often punctate leaves, and 

 cymose-paniculate discoid heads of white blue or purple 



