COMPOSITE. 41 



Heads with ray-flowers which are longer than 



in volucral bracts Chrysanthem urn. 



Heads heterogamous, flowers all disciformed. 

 3j flowers tetramerous. 



Flower-heads stalked Cotula. 



Flower-heads sessile Centipida (Myrioyyne) 

 3%. flowers pentamerous. 



Fruit not 5-costate ; -9- 1-seried. Artemisia. 

 Fruit 5-costate; 2-seried. Crossostephium. 



t 3. Pappus hair-like Senecioneoe. 



Heads homogamous. Style-branches with long acute 

 appendage at the apex of the stigmatic line, without 



distinct crown of long hairs Gynula. 



Heads homogamous or heterogamous ; style-branches with 

 a crown of hairs at the apex. 



Heads homogamous Cacalia. 



Heads heterogamous, involucral bracts more than 

 six which are not at all or very slightly imbricate. 



Senecio. 



Heads heterogamous, involucral bracts more than 6 



which are strongly imbricate Liyularia. 



f. Heads with at the margin mostly sterile ray-formed, disc-flowers 

 with unbranched style ; anthers acuminate at the base. Recep- 

 tacles without palea Calendulas. 



(j. Style thickened or furnished with a crown of hairs at the base of 



furcation Cynareaa. 



Heads 1 -flowered, collected into a head-like cluster Echinops. 



Heads many-flowered, simple. 



Filaments naked Saussurea. 



Filaments verrucose, hairy or ciliate Ctrsium. 



h. Heads homogamous or heterogamous. Margin-flowers, if exist, 2- 

 lipped ; disc-flowers ray-formed, with deep-cleft limb or 2-lipped. 



. .Mutisfee. 



