coMrosiT-i:. 41 



Heads with ray-flowers wliich arc L)iiger than 



i n vol iicral hracts Cltrysanthem um. 



Heads heterogamoiis, flowers all disciformed. 

 "^ flowers tetramerous. 



Flower-hcads stalked Cot ida. 



Flower-heads sessile Centipida [MTjriofjyne) 

 ^ riowers x^eiitamerous. 



Fruit not 5-costate ; ^- l-seried. Artemisia. 

 Fruit .3-costate; -^- 2-seried. Crossostephiicm. 



^i. Pappus hair-like Senecionefe. 



Heads homogamous. Style-hranches with kmg acute 

 appendage at the apex of the stigmatic line, witliout 



distinct crown of hjng liaiis Gymda. 



Heads homogamous or heterogamous ; st\'le-]jranchcs witli 

 a crown of hairs at tlie apex. 



Heads liomogamous Cacalia. 



Heads heterogamous, invohicral l)racts more than 

 six Avhich are not at all or vcry slightly imhricate. 



Senecio. 



Heads heterogamous, iiivohicral ])racts more than G 



which are strongly iinljricate Ligidaria. 



f. Heads witli -9- fit the margin mostly stcrile ray-formed, disc-flovvers 

 with uiihranched style ; anthers acumiaate at the base. Recep- 



tacles without palcji Calendulae, 



(j. Style thiclcened or furnislied witli a crown of hairs at tlie hase of 



furcation Cvnaret'©. 



Heads 1-flowered; coUected into a heafl-lilce cbistcr Echinops. 



Hcads many-flowered, simple. 



Filaments naked Saussurea. 



Fihiinents verrucose, hairy or ciliate Cirsium. 



h. Heads lit^mogamous or heterogamous. Margin-flowers, if exist, 2- 

 lipped ; disc-flowcrs ray-formed, witli decp-cleft limb or 2-lipped. 

 Mutisicjc. 



