40 COMPOSITE. 



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

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

 furnished with a terminal crown of hairs. 

 a. 1%. flowers all sterile. 



Pappus-sette deciduous connate at the "base... 



Leontopodium. 



Pappus-seta3 free at the base Anaphalis. 



p. 3j flowers all fertile Gnaplialium. 



ii. -9- flowers ligulate Carpesium. 



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

 of longer hairs. Anthers rounded at the base. 

 ex. Pappus not hair-like. 



I. Iiivolucral bracts without scarious blades. 



Receptacles with palea3 Helianthea3. 



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

 Corolla advanced. 

 Fruit not compressed. 



Inner involucral bracts concave embracing 



the marginal fruits. Pappus 



Sieyesbeckia. 



Inner involucral bracts flat. 



Palea very narrow Eclipta. 



Palea wide. 



Margin flowers -^ Wedelia. 



Margin flowers neutral Hcliantlius. 



Fruit dorsally compressed. 



Setfe with retrorse hairs. 



Leaves alternate Glossogyne. 



Leaves opposite Bldens. 



* Seta? without retrorse hairs... Synedrella. 



Receptacles without palea Tagetes. 



II. Involucral bracts with scarious blades at the margin 

 and apex. Pappus or reduced Anthemidesa. 



