40 COMPOSITE. 



Heads collected into a head-like cluster... SpUceranthus. 

 2. Styles of ^. flowers mostly truncate at the apex and 

 furnished with a terminal crown of hairs. 

 oc. 3j flowers all sterile. 



Pappus-setae deciduous connate at the base... 



Leontopodium. 



Pappus-seta3 free at the base Anaphalis. 



j. 3 flowers all fertile Gnaphalium. 



n. -9- flowers ligulate Carpesium. 



e. Heads liomogamous or heterogamous. Style-branches with a crown 

 of longer hairs. Anthers rounded at the base, 

 a. Pappus not hair-like. 



I. Involucral bracts without scarious blades. 



Eeceptacles with pale;e Helian there. 



Corolla of -9- 0. Heads unisexual ...Xanthium. 

 Corolla advanced. 

 Fruit not compressed. 



Inner involucral bracts concave embracing 



\U 



the marginal fruits. Pappus 



Siegesbeckia. 



Inner involucral bracts flat. 



Palea very narrow Eclipta. 



Palea wide. 



Margin flowers -^ Wedelia. 



Margin flowers neutral Helianthus. 



Fruit dorsally compressed. 



Seta? with retrorse liairs. 



Leaves alternate Grlossogyne. 



Leaves opposite Bidens. 



'' Seta? without retrorse hairs... Synedrella. 



Rcce}itacles without ]>alea Tagetes. 



IT. Involucral bracts with scarious blades at the manmi 



o 



and apex. Pappus or reduced \nthemidere. 



